established · -2.1 market domain

Email

Score 30.2 / 100 194 providers +126 via APIs 190 APIs Search apis.io →
Workflows using this tag
Stytch SMS One-Time Passcode Login · Stytch Stytch B2B Create Organization and Invite Member · Stytch Stytch B2B Email OTP Discovery and Exchange · Stytch Stytch OAuth Authenticate and Session · Stytch Stytch User Create, Search, and Delete · Stytch Stytch Password Reset by Email · Stytch Stytch TOTP Authenticator Enrollment · Stytch Stytch B2B TOTP Authenticator Enrollment · Stytch
Business capabilities this tag reaches
Marketing Management 3 Customer Service Management 3 Cybersecurity Management 2 Information & Data Management 2 Compliance Management 1
Variants seen in the corpus: EmailsEmail

Providers using this tag (194)

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 32 Complete, well-documented, and agent-ready
TwilioAuthenticationCommunicationsContact Center55 APIs91.6NylasCalendarCommunicationsContacts2 APIs87.4SendGridEmail APIMarketing EmailSMTP44 APIs85.9Customer.ioBehavioral DataBroadcastCampaignsCDP5 APIs84.0AhaSendTransactional EmailDeveloper ToolsSMTP2 APIs82.8BrevoMarketingMarketing AutomationEmail MarketingTransactional Email21 APIs80.8KitEmail MarketingCreator EconomySubscribersAutomation2 APIs79.7OutreachSalesSales EngagementSequencesCRM1 API79.3Salesforce Marketing CloudAutomationContent ManagementCustomer JourneyDigital Marketing1 API79.1Amazon SESEmail DeliverabilityEmail ServiceMarketing Email2 APIs79.0Amazon PinpointCampaignsCommunicationsMarketing2 APIs77.8PauboxHIPAAHealthcareCompliance3 APIs77.0MailchimpCampaignsEmail MarketingMarketing AutomationNewsletters4 APIs76.7ActiveCampaignMarketing AutomationEmail MarketingCRMSales Automation7 APIs76.6OneSignalNotificationPushSMS2 APIs74.7PlunkTransactional EmailMarketingAutomation2 APIs73.6BrazeCustomer EngagementMarketing AutomationMessagingPush Notifications1 API73.5beehiivNewslettersCreatorsSubscription3 APIs72.1KlaviyoMarketingSMSCustomer Data1 API72.0LoopsEmail APIMarketing AutomationTransactional Email1 API70.1AWeberEmail MarketingMarketing AutomationNewsletters5 APIs69.0PostmarkMessagingTransactional EmailDeliverability3 APIs68.7SendPulseMarketingMarketing AutomationTransactional Email20 APIs68.4Constant ContactCampaignsContactsEmail MarketingEvent2 APIs68.0IterableCross-Channel MessagingCustomer EngagementMarketing Automation2 APIs67.5MailboxlayerEmail VerificationSMTPMX Records2 APIs67.4SMTP2GOEmail DeliveryTransactional EmailSMTP1 API67.4ZeroBounceEmail VerificationEmail DeliverabilityMarketingLead Scoring1 API67.1InfobipTelecommunicationsCroatiaCPaaSMessaging50 APIs84.9Mapp Marketing CloudCompanyMarketingMarketing Automation4 APIs70.4MoEngageCustomer EngagementMarketing AutomationCustomer Data PlatformPush Notifications30 APIs68.9Live Direct MarketingCompanyEmail DeliverabilitySales & marketing automation2 APIs68.2
Strong 40 Solid coverage with minor gaps
Act-OnCompanyMarketingMarketing AutomationEmail Marketing4 APIs66.1Microsoft OutlookCalendarContactsEnterprise1 API65.9AcousticCompanyMarTechMarketingMarketing Automation2 APIs65.2NovuNotificationMessagingIn-App1 API63.4TempMailGrab APItemporary-emailDisposable EmailOTP1 API63.2ExclaimerCompanyEmail SignaturesEmail Signature Management10 APIs63.1MailmodoInteractive EmailAMP for EmailMarketing Automation9 APIs63.0ButtondownAnalyticsAutomationMarkdown1 API62.9SalesloftSalesSales EngagementCadencesCRM1 API62.5FrontAppCompanyCommunicationsCustomer ServiceShared Inbox2 APIs61.8KnockNotificationMessagingInfrastructureWorkflows2 APIs61.2EmailConnect by XADICompanyWebhookEU1 API60.7MoosendEmail MarketingMarketing AutomationCampaignsMailing Lists1 API60.5AgentMailCompanyArtificial IntelligenceAI Agents1 API60.4ZavuCompanyMessagingSMSWhatsApp1 API60.0SalesflareCRMSalesB2BContacts2 APIs59.3Microsoft ExchangeCalendarCollaborationContacts6 APIs58.7NeverBounceEmail VerificationEmail HygieneDeliverabilityMarketing1 API58.7EvercontactCompanyContact ManagementContact DataData Enrichment1 API58.6DyspatchCompanyEmail TemplatesMarketing1 API58.5Amazon WorkMailBusiness CommunicationCalendarEnterprise1 API57.6HatchCompanyVertical SoftwareCustomer CommunicationConversational AI1 API57.4EmailOctopusEmail MarketingNewslettersCampaigns1 API57.3WunderkindCompanyMarketingPersonalizationIdentity Resolution5 APIs57.0Amazon SNSMessagingNotificationPub/Sub1 API56.9MailerSendTransactional EmailSMTPMarketing1 API56.3KickboxEmail VerificationDeliverabilityData Quality2 APIs55.8BlueshiftCustomer Data PlatformCustomer EngagementMarketing AutomationCross-Channel Messaging1 API65.9OrttoMarketing AutomationCDPCustomer Data PlatformAnalytics1 API65.9cPanelControl PanelDNSDomains2 APIs64.7CommuneNewslettersCommunityPublishing1 API64.2Microsoft GraphMicrosoft GraphAzure ADCollaborationContacts71 APIs62.6ZohoAnalyticsCollaborationCRMCustomer Service267 APIs61.9NationBuilderCommunity OrganizingCRMPoliticalNon-Profit1 API61.8Google WorkspaceCalendarCollaborationProductivity1 API60.4CordialCompanyMarketingMarketing AutomationMessaging2 APIs58.1BluecoreCompanyRetailMarketingCustomer Data Platform2 APIs57.7LindyAI AgentsAI AutomationMCPWorkflow Automation1 API57.2MixmaxCompanySoftware-as-a-ServiceMCPAgents1 API54.8InsiderCompanyCustomer EngagementPersonalizationCustomer Data Platform18 APIs54.4
Developing 31 Usable, with meaningful gaps to close
GladlyCustomer ServiceCustomer ExperienceContact CenterAI Customer Service1 API54.0HiverCompanyCustomer ServiceHelp DeskShared Inbox1 API53.5ResendDeveloper ToolsTransactional EmailMarketing Email1 API52.6Movable InkCompanyMarketingPersonalization2 APIs51.6Netcore CloudCompanySMSWhatsApp9 APIs50.2Elastic EmailCompanyMarketingSoftware-as-a-Service5 APIs50.1YoxelCompanyIntegrationCalendar1 API49.0BirdCommunicationsSMSWhatsApp23 APIs48.6Apsis19b1MarketingAutomationArtificial Intelligence2 APIs48.3uCheckerEmail VerificationSMTPDNS1 API47.8MissiveTeam InboxCollaborationMessaging1 API46.4Help ScoutCustomer ServiceHelp DeskLive Chat17 APIs45.4Return PathCompanyMarTechEmail Deliverability11 APIs45.2StaffbaseCompanyEmployee CommunicationsInternal CommunicationsEmployee Experience1 API41.0MailjetEmail DeliveryMarketing EmailSMTP1 API40.2ProofpointSecurityCybersecurityEmail SecurityThreat Intelligence7 APIs40.1SEDNACompanyShippingMaritime1 API40.1FynoNotificationMessagingCommunicationsPush Notifications1 API40.0WhippyCommunicationsMessagingSMS1 API39.9Val TownDeveloper ToolsServerlessJavaScriptTypeScript1 API39.7Route MobileTelecommunicationsIndiaCPaaSMessaging5 APIs51.6FrontCustomer ServiceInboxCustomer Operations2 APIs49.7listmonkNewslettersMailing ListMarketing2 APIs45.5SuprSendNotificationMulti-ChannelSMS1 API45.401MindAgentsAgentic CommerceA2AMCP1 API45.3shveikCompanyAI Agentsx402Web Scraping5 APIs45.0AOLDigital MediaNewsEntertainmentAdvertising1 API44.6Google GmailDraftsGmailGoogle1 API44.1ConversicaCompanyArtificial IntelligenceConversational AIAI Agents1 API40.8SubstackNewslettersPublishingCreator EconomySubscription3 APIs39.9Microsoft 365ProductivityCollaborationCalendar1 API39.4
Thin 31 Limited public surface area
OrisiftCompanyValidationPhone1 API38.2FastmailPrivacySecurityBusiness1 API38.1SparkPostTransactional EmailMarketing EmailEmail Delivery10 APIs37.9MailtrapEmail DeliveryEmail SandboxEmail Testing2 APIs37.8JeengCompanyAdvertisingPublishing6 APIs37.4PreVeilEncryptionEnd-to-End EncryptionFile Sharing37.3Ocean SecurityCompanySecurityEmail SecurityCybersecurity1 API36.8LitmusDeveloper ToolsEmail TestingMarketing ToolsQuality Assurance4 APIs35.3MailerooEmail DeliveryMarketing EmailSMTP1 API35.1Zoho MailMailCollaborationMessaging1 API34.7CourierNotificationSMSPush1 API33.4TerminusCompanyAccount Based MarketingMarketingAdvertising3 APIs33.0SuperhumanCompanyProductivityArtificial Intelligence32.6MailgunTransactional EmailSMTPEmail Verification1 API30.9ShortwaveCompanyEmail ClientArtificial Intelligence30.5MacroCompanyProductivityCollaboration1 API29.6Opensense (formerly SenderGen)CompanyEmail Signature ManagementEmail MarketingBrand Management28.3VirtualminCompanyWeb HostingControl PanelServer Management1 API27.7GandiDNSDomainsDomain Registrar2 APIs27.3ZimbraCollaborationCalendarMessaging1 API27.3StensulCompanyEmail MarketingMarketing2 APIs27.0ClickSendCommunicationsSMSMMSVoice1 API26.9AirshipNotificationPushMobile1 API26.3NotificationAPINotificationMessagingSMS1 API26.2TucowsCompanyInfrastructureDomainsDNS2 APIs39.1AppgainCompanyMobile MarketingMarketing AutomationOmnichannel Messaging3 APIs36.6Apache JamesIMAPJavaJMAP9 APIs36.2FormspreeFormsBackendStatic Sites1 API35.4Microsoft Azure Communication ServicesIdentitySMS3 APIs33.3GOV.UK NotifyNotificationSMSText Messages1 API32.8PushCompanyCRMCustomer Data PlatformMarketing Automation1 API32.1
Emerging 27 Early or largely undocumented
MailPaceTransactional EmailMessagingSMTP1 API25.9EmailEngineEmail APIIMAPSMTP13 APIs25.0EngagespotNotificationIn-App NotificationsPush Notifications1 API23.1SpikeCompanyCollaborationTeam Chat22.6mxHeroCompanyCloud StorageContent Management1 API21.5PushwooshNotificationPushSMS1 API20.6LavenderCompanySalesArtificial Intelligence19.4SupafaxCompanyCalendarAI Assistant18.9INBOTIQACompanyShared InboxWorkflows17.2AegisAICompanyArtificial IntelligenceEmail SecurityCybersecurity16.3NameSiloDomainsDomain RegistrarDNSHosting1 API16.3OrbitelCompanyCPaaSMessagingSMS16.3AfilnetCompanyCommunicationsSMSVoice15.8SendinbluePublic APIs1 API15.6YampaCompanyArtificial IntelligenceAI AgentsCustomer Service15.4TownCompanyArtificial IntelligenceAgentsPersonal Assistant15.3BuildforeverCompanyArtificial IntelligenceConsumer14.4BoomerangCompanyProductivityScheduling12.4AvecCompanyProductivityArtificial Intelligence12.3Robylon AICustomer ServiceAI AgentsConversational AIVoice1 API11.2NovellCompanyEnterprise SoftwareCollaboration3 APIs25.4ResulticksCompanyMarketingMarketing AutomationOmnichannel1 API24.4LevityCompanyArtificial IntelligenceLogisticsSupply Chain18.3410 LabsCompanyProductivityInbox Management13.2NumeroCompanyEnterprise SaasPolitical CampaignsFundraising11.7SMTPSMTPInternet StandardsIETF2 APIs11.5Goomp Inc, Kalendar AICompanyArtificial IntelligenceSalesSales Automation1 API11.4
Minimal 32 Almost no public developer surface
SureCheckCompanyValidationPhone10.9TheSkimmCompanyConsumerMediaNewsletters10.3PostStackPublic APIs1 API10.2EmailioCompanyEmail ClientProductivity6.4ImprovMXPublic APIs1 API5.6MailboxValidatorPublic APIs1 API5.5Cloudmersive ValidatePublic APIs2 APIs5.2DisifyPublic APIs1 API5.2Email ValidationPublic APIs1 API5.2EmailJSPublic APIs1 API5.2Guerrilla MailPublic APIs1 API5.2mail.tmPublic APIs1 API5.2MailCheck.aiPublic APIs1 API4.2VerifierPublic APIs1 API4.2BoomTrainCompanyMarketingPersonalizationMachine Learning3.4HotmailCompanyWebmailConsumer3.4EVAPublic APIs1 API3.3Beachy'sRealNamesDomainPersonalization3.1AcompliCompanyMobileProductivity2.6GMSCommunicationsCPaaSMessaging2.5BrightmailCompanyAnti-SpamEmail Security0.0HabeasCompanyEmail DeliverabilityEmail Reputation0.0RapportiveCompanyContact IntelligenceGmail0.0Network SolutionsCompanyDomainsDomain RegistrationDomain Registrar9.8PostfixMail ServerMTASMTP1 API9.2CommunicationsCPaaSSMSMMSVoice8.7TripScoutCompanyTravelTravel DealsFlights6.1DropMailPublic APIs1 API5.2mail.gwPublic APIs1 API5.2AdKnowledgeCompanyConsumerAdvertisingMarketing0.0VerioCompanyWeb HostingInternet Service ProviderDomains0.0XimianCompanyOpen SourceLinuxGNOME0.0
Unrated 1 Not yet scored
SigstrCompanyEmail SignatureMarketing

APIs with this tag (187)

Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Exemplar 35 Complete, well-documented, and agent-ready
Salesforce Marketing Cloud SOAP APIThe Salesforce Marketing Cloud SOAP API is a full-featured SOAP web service interface for Marketing Cloud t...88.8Zoho CRM Emails APIThe Emails API from Zoho CRM — 2 operation(s) for emails.84.4Customer.io Emails APICreate and manage the emails you build in Design Studio, along with their translations and versions. - **Em...84.0AhaSend Email APIAPIs for sending emails82.8Optimizely Email APIThe Email API from Optimizely — 3 operation(s) for email.81.3Cloudflare Email Routing APIThe Cloudflare Email Routing API enables developers to create and manage custom email addresses and routing...80.6Content Builder APIREST API for creating and manipulating marketing content in Content Builder, a single cross-channel reposit...79.1Email Send Definition APIAPI for creating and managing email send definitions, which define the configuration for sending emails to ...79.1Amazon SES Email APIThe Email API from Amazon SES — 60 operation(s) for email.79.0Datadog Emails APIThe Emails API from Datadog — 1 operation(s) for emails.77.6Adobe Campaign APIManage marketing campaigns, deliveries, workflows, subscriptions, and profiles through REST APIs for cross-...77.3Cvent Registration Emails APIEvent planners use emails to invite registrants, market their events and request feedback from attendees. U...77.2Cvent Emails APIEvent planners use emails to invite registrants, market their events and request feedback from attendees. U...77.1Paubox MCP ServerHosted Model Context Protocol server exposing 30 Paubox tools across email, forms and email marketing to MC...77.0Microsoft Azure Communication Services APIAzure Communication Services provides multichannel communication APIs that enable developers to add voice, ...76.5Acquia Email APIThe Email API from Acquia — 1 operation(s) for email.75.5Okta Email APIThe MyAccount Email API provides operations to enroll, update, and delete emails. The API also provides uti...73.8Bloomreach Engagement APIREST API for the Bloomreach Engagement marketing automation and CDP platform, enabling customer tracking, s...71.3Cvent Event Cloud Emails APIEvent planners use emails to invite registrants, market their events and request feedback from attendees. U...70.9Auth0 Emails APIThe emails API from Auth0 — 1 operation(s) for emails.70.4Khoros Email APIThe Email API from Khoros — 1 operation(s) for email.70.4Loops MCP ServerRemote Model Context Protocol server for Loops, reachable at https://mcp.loops.so over Streamable HTTP with...70.1Loops WebhooksOutbound event surface. Seventeen signed event types covering contact lifecycle, mailing-list membership, a...70.1Laravel Email APIThe Email API from Laravel — 3 operation(s) for email.69.6Lightfield Emails APIThe Emails API from Lightfield — 4 operation(s) for emails.69.4Postmark Email APIThe Email API from Postmark — 4 operation(s) for email.68.7Conga Email APIThis controller provides access to email operations like sending email in post delivery.68.6SendPulse Emails APIThe Emails API from SendPulse — 7 operation(s) for emails.68.4Microsoft Email APISend email messages67.7Iterable Email APISend transactional emails and manage email-specific delivery settings.67.5SMTP2GO EMAILS APISend standard, MIME and batch email; manage scheduled sends67.4Encharge Transactional Email APIREST API for sending transactional emails through Encharge. Accepts JSON at POST /v1/emails/send with exact...67.3HighLevel Email APIDocumentation for Conversations API66.9Qualified Emails APIOutbound email activity sent from Qualified, with engagement timestamps.66.9SAP Emarsys Email APIThe Email API from SAP Emarsys — 34 operation(s) for email.66.5
Strong 57 Solid coverage with minor gaps
ServiceNow Email APIThe ServiceNow Email API provides REST endpoints for sending email messages from the Now Platform. It allow...66.0OCI Email Delivery APIREST APIs for sending high-volume and application-generated emails through Oracle Cloud Infrastructure, wit...65.9Extole Email APIThe Email API from Extole — 7 operation(s) for email.65.2Inflection.io Emails APIThe Emails API from Inflection.io — 2 operation(s) for creating and reading HTML emails.65.0Cvent Hospitality Cloud Emails APIEvent planners use emails to invite registrants, market their events and request feedback from attendees. U...64.6looot Email APIThe Email API from looot — 1 operation(s) for email.64.6Keap Email APIKeap Email API — 10 operations across 8 paths on the Keap REST v2 contract, read from Keap's own published ...64.4Airia Email APIThe Email API from Airia — 1 operation(s) for email.64.0Instantly Email APIA campaign email, a reply, a manually sent email, or any other email that's visible in the Unibox64.0Optus SMS Suite REST Email APICompanion REST API to the SMS gateway for scheduling and sending plain-text transactional email over a sepa...64.0Apollo.io Emailer Messages APIOne-off email drafting, sending, send status and content retrieval. 4 operation(s) from the published Apoll...63.6FirstPromoter Emails APIThe Emails API from FirstPromoter — 8 operation(s) for emails.63.3Buttondown Emails APIThe Emails API from Buttondown — 11 operation(s) covering drafting, scheduling, publishing, rendering and a...62.9Buttondown Newsletter PlatformThe Buttondown hosted newsletter platform provides a markdown-based composition experience, subscriber mana...62.9Fenergo Email APIThe Email API from Fenergo — 2 operation(s) for email.62.7Eclipse Foundation Email APIThe Email API from Eclipse Foundation — 1 operation(s) for email.62.6Salesloft Emails API[https://developer.salesloft.com/docs/api/emails/](https://developer.salesloft.com/docs/api/emails/)62.5Genesys Emails APIThe Emails API from Genesys — 2 operation(s) for emails.62.4KPN Email-to-SMS APIConverts inbound email into SMS messages delivered over the KPN network. Documented on the KPN Developer po...62.4Zoho Emails APIThe Emails API from Zoho — 2 operation(s) for emails.61.9Zoho MailThe Zoho Mail REST API allows developers to fetch email conversations and integrate Zoho Mail into applicat...61.9DomScan Email APIEmail blacklist checking, disposable domain detection, and email validation61.8Outlook Mail APIAccess email, manage folders, send mail, and manage mail settings via Microsoft Graph.61.8Axuall Email APIThe Email API from Axuall — 2 operation(s) for email.61.4RB2B Enrichment APICredit-metered Enrichment endpoints that take a known identifier — hashed email (MD5), plaintext email, or ...60.8Nutshell Emails APIIndividual email messages recorded against Nutshell records. 1 operation(s) across 1 path(s).60.7Gmail APISend and read email, manage drafts and labels, and handle mailbox settings.60.4Gmail Postmaster Tools APIGather statistics on bulk emails sent to Gmail users including spam reports and delivery errors.60.4Nooks Emails APIAccess email records60.4Stytch Email APIThe Email API from Stytch — 3 operation(s) for email.60.4Vessel Emails APIThe emails API from Vessel — 5 operation(s) for emails.59.3AutoGPT Email APIThe email API from AutoGPT — 2 operation(s) for email.59.2Amazon Web Services Email APIThe Email API from Amazon Web Services — 96 operation(s) for email.58.5Paragraph Emails APIThe emails API from Paragraph — 1 operation(s) for emails.58.4Vanilla Forums Emails APIThe Emails API from Vanilla Forums — 3 operation(s) for emails.58.0Clearbit Risk APIScores an email address for fraud and abuse risk. Endpoint /v1/calculate?email=. Verified live 2026-08-13 (...57.9Pipeliner CRM Email APIThe Email API from Pipeliner CRM — 50 operation(s) for email.57.9MixRank Email APIThe Email API from MixRank — 4 operation(s) for email.57.8Mastercard Email APIThe Email API from Mastercard — 2 operation(s) for email.57.3RevenueBase Email APIThe Email API from RevenueBase — 2 operation(s) for email.57.2Wunderkind Email APIEmail sending operations57.0Descope Email APIThe Email API from Descope — 10 operation(s) for email.56.5IRONSCALES Emails APIThe Emails API from IRONSCALES — 1 operation(s) for emails.56.4Marketo Emails APIEmail Controller56.4MailerSend APIMailerSend API v1 provides RESTful endpoints for sending emails (single, bulk, scheduled), templates, domai...56.3MailerSend Email APIThe Email API from MailerSend — 1 operation(s) for email.56.3Zoom Mail APIThe Zoom Mail API enables developers to programmatically access and manage mailbox data including draft man...56.2AnyAPI Email APIThe email API from AnyAPI — 2 operation(s) for email.55.3Forsta Email APIThe Email API from Forsta — 4 operation(s) for email.54.8Outlook Mail APIAPI for accessing and managing email, calendar, contacts, and tasks in Outlook.54.7OKKI Go Emails APIThe Emails API from OKKI Go (go.okki.ai) — 6 operations for batch and personalized cold-outreach email send...54.62s Email APIThe email API from 2s — 1 operation(s) for email.54.5Automattic Emails APIThe emails API from Automattic — 10 operation(s) for emails.54.5Insider Email APIThe Email API from Insider — 10 operation(s) for email.54.4Makinari Agents APIPer-agent HTTP endpoints — 48 documented operations under /api/agents/* covering chat (including a WebSocke...54.4DealHub Email APIThe Email API from DealHub — 1 operation(s) for email.54.3Street.co.uk Email APIThe Email API from Street.co.uk — 2 operation(s) for email.54.3
Developing 34 Usable, with meaningful gaps to close
Vertesia Email APIThe Email API from Vertesia — 4 operation(s) for email.54.1Adapt Email APIThe email API from Adapt — 2 operation(s) for email.53.9Chorus.ai Emails APIThe Emails API from Chorus.ai — 3 operation(s) for emails.53.1Resend Emails APIStart sending emails through the Resend API.52.6FusionAuth Email APIThe Email API from FusionAuth — 5 operation(s) for email.52.1Scaleway Emails APIThis section lists your emails and shows you how to manage them.52.0Soracom Email API[Email addresses](/en/docs/email/)51.5Verisoul Email APIThe Email API from Verisoul — 1 operation(s) for email.51.2ThingSpeak Alerts APISend email alerts from a channel via the alerts API or React, and retrieve alert history. Useful for enviro...50.9VaultRE Email APIOperations related to email50.9Elastic Email Emails APIThe Emails API from Elastic Email — 1 operation(s) for emails.50.1Nimble Messages APIMessage drafts — list and create draft messages. 2 operation(s).50.1Oracle Eloqua Emails APICreate and manage email assets49.8uChecker Валидация Email APIПроверка email-адресов, управление задачами валидации, получение и скачивание результатов47.8Aptly Email APIThe Email API from Aptly — 2 operation(s) for email.47.5Aerones Email APIThe email API from Aerones — 4 operation(s) for email.47.0Nextiva Email APIEmail-related workitem operations46.3Unlock Protocol Email APIThe Email API from Unlock Protocol — 3 operation(s) for email.45.9StackOne Unified Marketing API (Legacy)Legacy (no longer in active development; existing functionality remains supported). StackOne Unified Market...45.0Blueshiftlabs Emails APIThe Emails API from Blueshiftlabs — 2 operation(s) for emails.44.8LendKey Email APIThe email API from LendKey — 2 operation(s) for email.44.6PeopleSearch.im Email APIThe Email API from PeopleSearch.im — 1 operation(s) for email.44.4SEON Email APIThe Email API from SEON — 1 operation(s) for email.44.1Dealhubio Email APIThe Email API from Dealhubio — 1 operation(s) for email.43.8Kaltura Email APIThe email API from Kaltura — 1 operation(s) for email.43.7Kaleyra Email APISend single and batch transactional email (Email API v2) with domain management, templates, webhooks, and d...43.3ClimateAI Email APIemail sending operations42.9Iugu Emails APIThe Emails API from Iugu — 3 operation(s) for emails.41.6Openprovider Email APIThe Email API from Openprovider — 2 operation(s) for email.41.1Greenspark Email APIThe Email API from Greenspark — 14 operation(s) for email.40.7Packet Host Emails APIEmail Management40.5Proofpoint Secure Email Relay (SER) Email Submission APISecure Email Relay lets applications send authenticated transactional mail through Proofpoint rather than t...40.1Interfolio Emails APIEmail requests.39.9Val Town Emails APIEmails39.7
Thin 31 Limited public surface area
OpenSRS Email API (OMA)The OpenSRS Mail API is the provisioning interface for the OpenSRS hosted email system — create, modify and...39.1Wazo Emails APIThe emails API from Wazo — 5 operation(s) for emails.38.9Affinity Emails APIOperations about emails38.7YepAPI Email APIThe Email API from YepAPI — 1 operation(s) for email.37.7Unisson Emails APIThe emails API from Unisson — 7 operation(s) for emails.37.1Bonterra (fka EveryAction) Email APIThe Email API from Bonterra (fka EveryAction) — 2 operation(s) for email.37.0Appgain Notify APIThe messaging send service. A single POST /{projectId}/send endpoint whose channel is selected by the top-l...36.6Argo CD Notifications APIThe Argo CD Notifications subsystem delivers app lifecycle events (sync, health, deploy) to webhooks, Slack...36.6Resourcly Email APIThe email API from Resourcly — 1 operation(s) for email.36.5Apache James JMAP APIThe JMAP (JSON Meta Application Protocol) implementation in James provides a modern, efficient email protoc...36.2Equinix Emails APIEmail Management35.7Cloud Custodian C7n-Mailerc7n-mailer is a Cloud Custodian notification tool that subscribes to an SQS queue populated by policy actio...35.3Maileroo Emails APISend transactional and bulk emails35.1Sonatype Nexus Email APIThe Email API from Sonatype Nexus — 2 operation(s) for email.34.8Xoxoday Reward Links APIAPI for creating and sending personalized reward links via email, SMS, or chat. Supports campaign managemen...34.1Global Relay Email APIEndpoints for archiving email messages33.3microsoft-azure-communication-services Email APIThe Email API from microsoft-azure-communication-services — 1 operation(s) for email.33.3Employee Automation APIA dedicated service that streamlines management of users and employee signature data inside an Email Experi...33.0Verify APIEmail verification API — single-address real-time validation and asynchronous CSV batch verification, sold ...33.0Spree Klaviyo IntegrationOfficial Klaviyo marketing-platform integration for Spree - syncs customers, orders, and product events to ...32.9ORCID Email APIThe Email API from ORCID — 1 operation(s) for email.32.3XSKY Emails APIEmailController Operations about Email32.1Escape Emails APIRead scan inbox emails. The public API provides endpoints to list inbox emails and read their raw content w...31.1Bitmovin Emails APIThe Emails API from Bitmovin — 6 operation(s) for emails.29.9Primitive Emails APIList, inspect, and manage received emails28.8Terminal Email APIThe Email API from Terminal — 1 operation(s) for email.28.5docomo Mail IMAP InterfaceThe docomo Mail IMAP interface is the one machine-interface specification NTT DOCOMO publishes openly, with...28.3Gandi Email APIThe Gandi Email API allows you to manage email accounts and mailboxes.27.3Stensul Content APIEnterprise API for retrieving finalized Stensul email content and distributing it to any platform in a cust...27.0ClickSend Email APISend and view transactional email.26.9Airship Email & SMS APISend email and SMS messages alongside push.26.3
Emerging 12 Early or largely undocumented
P0 Agent Economy Index Email APIThe Email API from P0 Agent Economy Index — 2 operation(s) for email.25.7GroupWise Administration REST APIREST/JSON administration API for a GroupWise system, served by the GroupWise Administration Service that in...25.4GroupWise Web Services (SOAP)Server-side SOAP protocol for reading and writing a GroupWise user's mailbox, spoken directly to the GroupW...25.4lists.sr.ht GraphQL APIGraphQL API for managing mailing lists and email-based code review workflows on SourceHut, powered by git s...24.4Engagespot Notifications APIThe Engagespot REST API enables sending multi-channel notifications to users, listing and deleting notifica...23.1mxHERO Mail2Cloud Advanced (AI Email Knowledge)AI email knowledge-recovery service. Captured company email is optimized and stored in an isolated per-tena...21.5Lane API Email APIThe Email API from Lane API — 7 operation(s) for email.20.7Pushwoosh Messaging APISend push notifications, email, SMS and in-app messages to user audiences.20.6Stack Auth Emails APIThe Emails API from Stack Auth — 2 operation(s) for emails.18.1Bloomberg Email GatewayGateway service enabling Bloomberg IB messages to be sent and received via email for communication with cou...17.1SendinblueA service that provides solutions relating to marketing and/or transactional email and/or SMS15.6LiqPay Invoice APIAPI for generating and sending payment invoices to customers by email or phone number. Invoices include ite...13.1
Minimal 18 Almost no public developer surface
PostStackEU-hosted email API for transactional and marketing email, with contacts, broadcasts, and analytics10.2Postfix SMTPPostfix implements SMTP (RFC 5321) for sending and receiving electronic mail, with submission (port 587), S...9.2Buildium Communications APIManages emails, notes, and other communications stored against properties, leases, tenants, owners, and ven...8.0SAGARIS MCP ServerRead-only MCP server over Streamable HTTP (stateless JSON mode), workspace-key bearer auth, exposing 5 GET-...7.3SAGARIS REST APIREST API for the SAGARIS Agentic Revenue OS, including the Company Brain context endpoints. Bearer/workspac...7.3ImprovMXAPI for free email forwarding service5.6MailboxValidatorValidate email address to improve deliverability5.5Cloudmersive ValidateValidate international phone numbers5.2DisifyValidate and detect disposable and temporary email addresses5.2DropMailGraphQL API for creating and managing ephemeral e-mail inboxes5.2Email ValidationValidate email addresses for deliverability and spam5.2EmailJSSend emails directly from client-side JavaScript without a backend server5.2Guerrilla MailDisposable temporary Email addresses5.2mail.gw10 Minute Mail5.2mail.tmTemporary Email Service5.2MailCheck.aiPrevent users to sign up with temporary email addresses4.2VerifierVerifies that a given email is real4.2EVAValidate email addresses3.3

Companies reaching this through an API (126)

These companies publish an API, specification or operation carrying “Email” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.

2s Acquia Adapt Adobe Suite Aerones Affinity Airia Amazon Web Services Apollo.io Aptly Argo CD Auth0 AutoGPT Automattic Axuall Bitmovin Bloomberg Message Bloomreach Blueshiftlabs Bonterra (fka EveryAction) Buildium Chorus.ai Clearbit (HubSpot Breeze Intelligence) ClimateAI Cloud Custodian Cloudflare Conga Cvent Cvent Event Cloud Cvent Hospitality Cloud Cvent Registration Datadog DealHub Dealhubio Descope DomScan Eclipse Foundation Encharge Equinix Escape Extole Fenergo FirstPromoter Forsta FusionAuth Genesys Global Relay Greenspark HighLevel HubSpot
Show all 126 companies ↓
Inflection.io Instantly Interfolio IRONSCALES Iugu Kaleyra Kaltura Keap Khoros KPN Lane API Laravel LendKey Lightfield LiqPay looot Marketo Mastercard Microsoft Microsoft Azure Microsoft Office Microsoft Office 365 MixRank Nextiva Nimble Nooks NTT Docomo Nutshell Okta Openprovider Optimizely Optus Oracle Oracle Eloqua ORCID P0 Agent Economy Index Packet Host Paragraph PeopleSearch.im Pipeliner CRM Primitive Qualified RB2B Resourcly RevenueBase SAGARIS Salesforce SAP Emarsys Scaleway SEON ServiceNow Sonatype Nexus Soracom SourceHut Spree Commerce Stack Auth StackOne Street.co.uk Stytch Terminal ThingSpeak Uncodie (now Makinari) Unisson Unlock Protocol Vanilla Forums VaultRE Verisoul Vertesia Vessel Wazo Xiaoman (OKKI) Xoxoday XSKY YepAPI Zoho CRM Zoom

Score breakdown

Frequency
72.3
log-scaled weighted occurrences
Breadth
4.3
spread across providers
Quality lift
42.9
mean composite of providers using it
Cohesion
16.1
strength of nearest seed neighbor

Where this tag sits

194 providers carry this tag directly, and 319 counting the 7 narrower tags below — 125 more to reach.

SMTP 21 providers Email Marketing 79 providers Transactional Email 34 providers Email Security 34 providers Email Deliverability 8 providers Email Testing 6 providers Email Verification 37 providers

Related tags

SMS 65 co-occurrences Campaigns 51 co-occurrences Marketing Automation 43 co-occurrences Contacts 59 co-occurrences Messaging 66 co-occurrences Transactional Email 30 co-occurrences Templates 43 co-occurrences

Where this tag comes from

Provider tag199
Api tag190
Openapi tag85
Openapi op tag249

Markets provisional

Kin Score markets whose measured providers carry this tag. Share is the fraction of the market's measured providers that carry it — it describes the market, not this tag.

MarketShare of the market's providers
Communications (CPaaS)64%
Martech and Customer Data Platforms39%
Commerce and CRM36%

Cohort brief

Auto-generated

The 186 providers in the APIs.io catalog tagged Email, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
186
of 194 in the catalog
Mean Kin Score
42.4
+20.2 vs catalog 22.2
Mean Agent Readiness
27.1
+15.1 vs catalog 12
Spread
0–91.6
median 42.6 · σ 23.8
How the 186 split by band
Exemplar 32Strong 40Developing 31Thin 31Emerging 27Minimal 25
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Operational Transparency 36.5 13 +23.5 186
Access Clarity 47.2 23.9 +23.3 186
Developer Ergonomics 44.5 23.2 +21.3 186
Contract Quality 37.7 17.2 +20.5 186
Discoverability 65.5 57.9 +7.6 186
Contract Governance 12.4 6.5 +5.9 186

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes
ArtifactThis cohortCatalogDifference
MCP server (any) 34% 13% +21
MCP server (first-party) 34% 12% +22
Agent Skills 0% 0% 0
OAuth scopes 24% 11% +13
Security 98% 98% 0
Arazzo workflows 6% 2% +4
Governance rules 33% 16% +17

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score
  1. 1 Twilio 91.6
  2. 2 Nylas 87.5
  3. 3 SendGrid 85.9
  4. 4 Infobip 84.9
  5. 5 Customer.io 84.1
  6. 6 AhaSend 82.8
  7. 7 Brevo 80.8
  8. 8 Kit 79.7
  9. 9 Outreach 79.3
  10. 10 Salesforce Marketing Cloud 79.1
Top by Agent Readiness
  1. 1 OneSignal 71.3
  2. 2 Customer.io 69.9
  3. 3 MoEngage 66.2
  4. 4 AgentMail 64.6
  5. 5 Kit 64.4
  6. 6 Loops 62.2
  7. 7 Commune 61.6
  8. 8 Bird 61.5
  9. 9 Infobip 61.3
  10. 10 Cordial 61.2
All 194 members of this roster resolve to a provider in the catalog; 186 carry a score (96%). The figures above describe the scored members only.
Coverage caveat. 118 of 186 scored members had under half their catalog-attributable points satisfied at all (catalog_earned / catalog_max < 0.5). They are INCLUDED in the mean above. A large share here means the cohort mean is partly a measurement of how far our enrichment reached, not only of how these providers publish.Generated from the catalog build of 24 October 2026, across 31984 providers, using the same computation served by the APIs.io cohort API. Briefs are published for rosters of 5 or more scored providers; below that a distribution is not meaningful.

Work with this as data

Every tag here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for tags

7 MCP tools reach this
  • find_tagsBrowse and filter every tag in the catalog.
  • get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
  • cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
  • cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This tag 
curl "https://apis.io/api/v1/tags/email"
All tags 
curl "https://apis.io/api/v1/tags?limit=25"
As a scored cohort 
curl "https://apis.io/api/v1/cohorts/tag/email"
The distribution (Pro) 
curl "https://apis.io/api/v1/cohorts/tag/email/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.