canonical · 0.3 market domain

Email

Score 32.2 / 100 188 providers +115 via APIs 177 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 Cybersecurity Management 2 Customer Service Management 2 Information & Data Management 2 Compliance Management 1
Variants seen in the corpus: EmailsEmail

Providers using this tag (188)

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

Exemplar 37 Complete, well-documented, and agent-ready
NylasCalendarCommunicationsContacts2 APIs93.2AhaSendTransactional EmailDeveloper ToolsSMTP2 APIs84.3Customer.ioBehavioral DataBroadcastCampaignsCDP4 APIs83.8InfobipTelecommunicationsCroatiaCPaaSMessaging48 APIs82.4SendGridEmail APIMarketing EmailSMTP44 APIs82.4BrevoMarketingMarketing AutomationEmail MarketingTransactional Email21 APIs81.7Amazon SESEmail DeliverabilityEmail ServiceMarketing Email2 APIs80.5MailchimpCampaignsEmail MarketingMarketing AutomationNewsletters4 APIs79.2Amazon PinpointCampaignsCommunicationsMarketing2 APIs78.9KitEmail MarketingCreator EconomySubscribersAutomation2 APIs78.5TwilioAuthenticationCommunicationsContact Center40 APIs77.8ActiveCampaignMarketing AutomationEmail MarketingCRMSales Automation9 APIs77.6Salesforce Marketing CloudAutomationContent ManagementCustomer JourneyDigital Marketing1 API77.3OutreachSalesSales EngagementSequencesCRM2 APIs76.4OneSignalNotificationPushSMS2 APIs76.3BrazeCustomer EngagementMarketing AutomationMessagingPush Notifications1 API75.1PlunkTransactional EmailMarketingAutomation2 APIs75.1MailerLiteEmail MarketingAutomationNewslettersSubscribers1 API73.7KlaviyoMarketingSMSCustomer Data1 API73.6beehiivNewslettersCreatorsSubscription5 APIs73.1HunterContact DiscoveryEmail VerificationLead Generation1 API71.9LoopsEmail APIMarketing AutomationTransactional Email1 API71.4NovuNotificationMessagingIn-App1 API71.1Mapp Marketing CloudCompanyMarketingMarketing Automation4 APIs70.4PostmarkMessagingTransactional EmailDeliverability3 APIs70.2SendPulseMarketingMarketing AutomationTransactional Email20 APIs69.5Constant ContactCampaignsContactsEmail MarketingEvent2 APIs69.4IterableCross-Channel MessagingCustomer EngagementMarketing Automation2 APIs69.1MoEngageCustomer EngagementMarketing AutomationCustomer Data PlatformPush Notifications30 APIs69.0SMTP2GOEmail DeliveryTransactional EmailSMTP1 API69.0MailboxlayerEmail VerificationSMTPMX Records2 APIs68.9PauboxHIPAAHealthcareCompliance3 APIs68.4KnockNotificationMessagingInfrastructureWorkflows13 APIs68.1Live Direct MarketingCompanyEmail DeliverabilitySales & marketing automation4 APIs68.1AWeberEmail MarketingMarketing AutomationNewsletters4 APIs67.7OrttoMarketing AutomationCDPCustomer Data PlatformAnalytics1 API67.5ZeroBounceEmail VerificationEmail DeliverabilityMarketingLead Scoring1 API67.1
Strong 33 Solid coverage with minor gaps
cPanelControl PanelDNSDomains3 APIs66.2Microsoft OutlookCalendarContactsEnterprise1 API66.0BlueshiftCustomer Data PlatformCustomer EngagementMarketing AutomationCross-Channel Messaging2 APIs65.9ZohoAnalyticsCollaborationCRMCustomer Service267 APIs65.1AcousticCompanyMarTechMarketingMarketing Automation2 APIs64.7ButtondownAnalyticsAutomationMarkdown1 API64.4MailmodoInteractive EmailAMP for EmailMarketing Automation9 APIs64.4Microsoft GraphMicrosoft GraphAzure ADCollaborationContacts71 APIs63.5SalesloftSalesSales EngagementCadencesCRM1 API63.5ExclaimerCompanyEmail SignaturesEmail Signature Management10 APIs63.0TempMailGrab APItemporary-emailDisposable EmailOTP2 APIs62.4MoosendEmail MarketingMarketing AutomationCampaignsMailing Lists1 API62.1NationBuilderCommunity OrganizingCRMPoliticalNon-Profit1 API61.2SalesflareCRMSalesB2BContacts2 APIs60.8Google WorkspaceCalendarCollaborationProductivity1 API60.5AgentMailCompanyArtificial IntelligenceAI Agents1 API60.2ZavuCompanyMessagingSMSWhatsApp1 API60.1GladlyCustomer ServiceCustomer ExperienceContact CenterAI Customer Service1 API59.4EmailOctopusEmail MarketingNewslettersCampaigns2 APIs58.9LindyAI AgentsAI AutomationMCPWorkflow Automation1 API58.7NeverBounceEmail VerificationEmail HygieneDeliverabilityMarketing1 API58.6Amazon SNSMessagingNotificationPub-Sub1 API58.5EvercontactCompanyContact ManagementContact DataData Enrichment1 API58.5DyspatchCompanyEmail TemplatesMarketing1 API58.3Microsoft ExchangeCalendarCollaborationContacts6 APIs58.3CordialCompanyMarketingMarketing AutomationMessaging2 APIs58.2Act-OnCompanyMarketingMarketing AutomationEmail Marketing8 APIs57.9HatchCompanyVertical SoftwareCustomer CommunicationConversational AI1 API57.4MailerSendTransactional EmailSMTPMarketing1 API57.4Amazon WorkMailBusiness CommunicationCalendarEnterprise1 API57.1WunderkindCompanyMarketingPersonalizationIdentity Resolution5 APIs57.1KickboxEmail VerificationDeliverabilityData Quality2 APIs55.7MixmaxCompanySoftware-as-a-ServiceMCPAgents1 API54.7
Developing 33 Usable, with meaningful gaps to close
ResendDeveloper ToolsTransactional EmailMarketing Email1 API54.1InsiderCompanyCustomer EngagementPersonalizationCustomer Data Platform18 APIs54.0SuprSendNotificationMulti-ChannelSMS1 API53.8HiverCompanyCustomer ServiceHelp DeskShared Inbox1 API53.4EmailRepSecurityEmail ReputationThreat Intelligence1 API52.9Movable InkCompanyMarketingPersonalization2 APIs51.6Route MobileTelecommunicationsIndiaCPaaSMessaging5 APIs51.0FrontAppCompanyCommunicationsCustomer ServiceShared Inbox1 API49.9FrontCustomer SupportInboxCustomer Operations2 APIs49.3BluecoreCompanyRetailMarketingCustomer Data Platform3 APIs48.8FynoNotificationMessagingCommunicationsPush Notifications1 API48.3MagicBellNotificationPush NotificationsIn-App Notifications1 API48.3Apsis19b1MarketingAutomationArtificial Intelligence2 APIs48.2uCheckerEmail VerificationSMTPDNS1 API47.7listmonkNewslettersMailing ListMarketing2 APIs47.1Val TownDeveloper ToolsServerlessJavaScriptTypeScript1 API47.1Help ScoutCustomer SupportHelp DeskLive Chat17 APIs46.9CommsHarborTransactional EmailEmail MarketingCommunications2 APIs46.5MissiveTeam InboxCollaborationMessaging1 API46.5AOLDigital MediaNewsEntertainmentAdvertising1 API45.6BirdCommunicationsSMSWhatsApp23 APIs45.501MindAgentsAgentic CommerceA2AMCP1 API45.2Return PathCompanyMarTechEmail Deliverability11 APIs45.1Google GmailDraftsGmailGoogle1 API44.2SparkPostTransactional EmailMarketing EmailEmail Delivery10 APIs43.9MailjetEmail DeliveryMarketing EmailSMTP1 API41.6WhippyCommunicationsMessagingSMS1 API41.5StaffbaseCompanyEmployee CommunicationsInternal CommunicationsEmployee Experience1 API41.0ConversicaCompanyArtificial IntelligenceConversational AIAI Agents1 API40.2ProofpointSecurityCybersecurityEmail SecurityThreat Intelligence7 APIs40.0SEDNACompanyShippingMaritime1 API40.0GOV.UK NotifyNotificationSMSText Messages1 API39.9SubstackNewslettersPublishingCreator EconomySubscription3 APIs39.8
Thin 30 Limited public surface area
Zoho MailMailCollaborationMessaging1 API39.0TucowsCompanyInfrastructureDomainsDNS2 APIs38.6Apache JamesIMAPJavaJMAP1 API38.5OrisiftCompanyValidationPhone1 API38.1Microsoft 365ProductivityCollaborationCalendar1 API38.0MailtrapEmail DeliveryEmail SandboxEmail Testing2 APIs37.5JeengCompanyAdvertisingPublishing6 APIs37.4PreVeilEncryptionEnd-to-End EncryptionFile Sharing37.2Ocean SecurityCompanySecurityEmail SecurityCybersecurity1 API36.8AppgainCompanyMobile MarketingMarketing AutomationOmnichannel Messaging3 APIs36.7LitmusDeveloper ToolsEmail TestingMarketing ToolsQuality Assurance3 APIs36.6MailerooEmail DeliveryMarketing EmailSMTP1 API36.6ClickSendCommunicationsSMSMMSVoice1 API35.3FormspreeFormsBackendStatic Sites1 API35.1CourierNotificationSMSPush1 API35.0Microsoft Azure Communication ServicesIdentitySMS3 APIs34.9NotificationAPINotificationMessagingSMS1 API34.6TerminusCompanyAccount Based MarketingMarketingAdvertising3 APIs32.9MailPaceTransactional EmailMessagingSMTP1 API32.8PushCompanyCRMCustomer Data PlatformMarketing Automation1 API32.1EngagespotNotificationIn-App NotificationsPush Notifications1 API31.5MailgunTransactional EmailSMTPEmail Verification1 API30.9MacroCompanyProductivityCollaboration1 API29.5Opensense (formerly SenderGen)CompanyEmail Signature ManagementEmail MarketingBrand Management28.2VirtualminCompanyWeb HostingControl PanelServer Management1 API27.6GandiDNSDomainsDomain Registrar2 APIs27.5ZimbraCollaborationCalendarMessaging1 API27.2EmailEngineEmail APIIMAPSMTP13 APIs26.6AirshipNotificationPushMobile1 API26.5SuperhumanCompanyProductivityArtificial Intelligence26.2
Emerging 21 Early or largely undocumented
StensulCompanyEmail MarketingMarketing2 APIs25.6NovellCompanyEnterprise SoftwareCollaboration3 APIs25.3ShortwaveCompanyEmail ClientArtificial Intelligence24.5ResulticksCompanyMarketingMarketing AutomationOmnichannel1 API24.4PushwooshNotificationPushSMS1 API22.0LavenderCompanySalesArtificial Intelligence19.3SupafaxCompanyCalendarAI Assistant19.3LevityCompanyArtificial IntelligenceLogisticsSupply Chain18.2NameSiloDomainsDomain RegistrarDNSHosting1 API17.4AegisAICompanyArtificial IntelligenceEmail SecurityCybersecurity16.3SpikeCompanyCollaborationTeam Chat16.2SendinbluePublic APIs1 API15.5YampaCompanyAi MlAI AgentsCustomer Service15.5mxHeroCompanyCloud StorageContent Management1 API15.1BuildforeverCompanyArtificial IntelligenceConsumer14.4410 LabsCompanyProductivityInbox Management13.1SMTPSMTPInternet StandardsIETF2 APIs13.0BoomerangCompanyProductivityScheduling12.3AvecCompanyProductivityArtificial Intelligence12.2NumeroCompanyEnterprise SaasPolitical CampaignsFundraising11.6Robylon AICustomer SupportAI AgentsConversational AIVoice1 API11.1
Minimal 33 Almost no public developer surface
Goomp Inc, Kalendar AICompanyArtificial IntelligenceSalesSales Automation1 API10.9INBOTIQACompanyShared InboxWorkflows10.8Network SolutionsCompanyDomainsDomain RegistrationDomain Registrar9.7TheSkimmCompanyConsumerMediaNewsletters9.7PostfixMail ServerMTASMTP1 API9.1PostStackPublic APIs1 API8.3EmailioCompanyEmail ClientProductivity6.3TownCompanyArtificial IntelligenceAgentsPersonal Assistant6.3TripScoutCompanyTravelTravel DealsFlights6.0ImprovMXPublic APIs1 API5.6MailboxValidatorPublic APIs1 API5.4Cloudmersive ValidatePublic APIs2 APIs5.1DisifyPublic APIs1 API5.1DropMailPublic APIs1 API5.1Email ValidationPublic APIs1 API5.1EmailJSPublic APIs1 API5.1Guerrilla MailPublic APIs1 API5.1mail.gwPublic APIs1 API5.1mail.tmPublic APIs1 API5.1MailCheck.aiPublic APIs1 API4.1VerifierPublic APIs1 API4.1HotmailCompanyWebmailConsumer3.4BoomTrainCompanyMarketingPersonalizationMachine Learning3.3EVAPublic APIs1 API3.3Beachy'sRealNamesDomainPersonalization3.0AcompliCompanyMobileProductivity2.5GMSCommunicationsCPaaSMessaging2.0AdKnowledgeCompanyConsumerAdvertisingMarketing0.0BrightmailCompanyAnti-SpamEmail Security0.0HabeasCompanyEmail DeliverabilityEmail Reputation0.0RapportiveCompanyContact IntelligenceGmail0.0VerioCompanyWeb HostingInternet Service ProviderDomains0.0XimianCompanyOpen SourceLinuxGNOME0.0
Unrated 1 Not yet scored
SigstrCompanyEmail SignatureMarketing

APIs with this tag (172)

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 31 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...91.0AhaSend Email APIAPIs for sending emails84.3Optimizely Email APIThe Email API from Optimizely — 3 operation(s) for email.80.8Cloudflare Email Routing APIThe Cloudflare Email Routing API enables developers to create and manage custom email addresses and routing...80.6Amazon SES Email APIThe Email API from Amazon SES — 60 operation(s) for email.80.5Datadog Emails APIThe Emails API from Datadog — 1 operation(s) for emails.79.1Adobe Campaign APIManage marketing campaigns, deliveries, workflows, subscriptions, and profiles through REST APIs for cross-...78.3Zoho CRM Emails APIThe Emails API from Zoho CRM — 2 operation(s) for emails.78.1Cvent Emails APIEvent planners use emails to invite registrants, market their events and request feedback from attendees. U...78.0Content Builder APIREST API for creating and manipulating marketing content in Content Builder, a single cross-channel reposit...77.3Email Send Definition APIAPI for creating and managing email send definitions, which define the configuration for sending emails to ...77.3Cvent Registration Emails APIEvent planners use emails to invite registrants, market their events and request feedback from attendees. U...76.9Acquia Email APIThe Email API from Acquia — 1 operation(s) for email.76.8Microsoft Azure Communication Services APIAzure Communication Services provides multichannel communication APIs that enable developers to add voice, ...76.2Okta Email APIThe MyAccount Email API provides operations to enroll, update, and delete emails. The API also provides uti...75.3Bloomreach Engagement APIREST API for the Bloomreach Engagement marketing automation and CDP platform, enabling customer tracking, s...72.3Cvent Event Cloud Emails APIEvent planners use emails to invite registrants, market their events and request feedback from attendees. U...71.9Loops MCP ServerRemote Model Context Protocol server for Loops, reachable at https://mcp.loops.so over Streamable HTTP with...71.4Loops WebhooksOutbound event surface. Seventeen signed event types covering contact lifecycle, mailing-list membership, a...71.4Postmark Email APIThe Email API from Postmark — 4 operation(s) for email.70.2Auth0 Emails APIThe emails API from Auth0 — 1 operation(s) for emails.70.0SendPulse Emails APIThe Emails API from SendPulse — 7 operation(s) for emails.69.5Lightfield Emails APIThe Emails API from Lightfield — 4 operation(s) for emails.69.4Microsoft Email APISend email messages69.2Iterable Email APISend transactional emails and manage email-specific delivery settings.69.1SMTP2GO EMAILS APISend standard, MIME and batch email; manage scheduled sends69.0Paubox MCP ServerHosted Model Context Protocol server exposing 30 Paubox tools across email, forms and email marketing to MC...68.4Conga Email APIThis controller provides access to email operations like sending email in post delivery.68.0ServiceNow Email APIThe ServiceNow Email API provides REST endpoints for sending email messages from the Now Platform. It allow...67.5Encharge Transactional Email APIREST API for sending transactional emails through Encharge. Accepts JSON at POST /v1/emails/send with exact...67.2Qualified Emails APIOutbound email activity sent from Qualified, with engagement timestamps.66.8
Strong 54 Solid coverage with minor gaps
HighLevel Email APIDocumentation for Conversations API66.4Instantly Email APIA campaign email, a reply, a manually sent email, or any other email that's visible in the Unibox66.0OCI Email Delivery APIREST APIs for sending high-volume and application-generated emails through Oracle Cloud Infrastructure, wit...66.0SAP Emarsys Email APIThe Email API from SAP Emarsys — 34 operation(s) for email.66.0Cvent Hospitality Cloud Emails APIEvent planners use emails to invite registrants, market their events and request feedback from attendees. U...65.6Gravitee Email APIThe email API from Gravitee — 4 operation(s) for email.65.2Apollo.io Emailer Messages APIOne-off email drafting, sending, send status and content retrieval. 4 operation(s) from the published Apoll...65.1Zoho Emails APIThe Emails API from Zoho — 2 operation(s) for emails.65.1Zoho MailThe Zoho Mail REST API allows developers to fetch email conversations and integrate Zoho Mail into applicat...65.1Extole Email APIThe Email API from Extole — 7 operation(s) for email.64.6Inflection.io Emails APIThe Emails API from Inflection.io — 2 operation(s) for creating and reading HTML emails.64.6Buttondown Emails APIThe Emails API from Buttondown — 11 operation(s) covering drafting, scheduling, publishing, rendering and a...64.4Buttondown Newsletter PlatformThe Buttondown hosted newsletter platform provides a markdown-based composition experience, subscriber mana...64.4FirstPromoter Emails APIThe Emails API from FirstPromoter — 8 operation(s) for emails.64.3Vessel Emails APIThe emails API from Vessel — 5 operation(s) for emails.64.0Keap Email APIKeap Email API — 10 operations across 8 paths on the Keap REST v2 contract, read from Keap's own published ...63.9Eclipse Foundation Email APIThe Email API from Eclipse Foundation — 1 operation(s) for email.63.6Salesloft Emails API[https://developer.salesloft.com/docs/api/emails/](https://developer.salesloft.com/docs/api/emails/)63.5Fenergo Email APIThe Email API from Fenergo — 2 operation(s) for email.62.3KPN Email-to-SMS APIConverts inbound email into SMS messages delivered over the KPN network. Documented on the KPN Developer po...61.9Outlook Mail APIAccess email, manage folders, send mail, and manage mail settings via Microsoft Graph.61.9DomScan Email APIEmail blacklist checking, disposable domain detection, and email validation61.5Stytch Email APIThe Email API from Stytch — 3 operation(s) for email.61.4Nutshell Emails APIIndividual email messages recorded against Nutshell records. 1 operation(s) across 1 path(s).60.6Gmail APISend and read email, manage drafts and labels, and handle mailbox settings.60.5Gmail Postmaster Tools APIGather statistics on bulk emails sent to Gmail users including spam reports and delivery errors.60.5Genesys Emails APIThe Emails API from Genesys — 2 operation(s) for emails.60.3Nooks Emails APIAccess email records60.0Amazon Web Services Email APIThe Email API from Amazon Web Services — 96 operation(s) for email.59.6Clearbit Risk APIScores an email address for fraud and abuse risk. Endpoint /v1/calculate?email=. Verified live 2026-08-13 (...59.4RB2B Enrichment APICredit-metered Enrichment endpoints that take a known identifier — hashed email (MD5), plaintext email, or ...59.3ThingSpeak Alerts APISend email alerts from a channel via the alerts API or React, and retrieve alert history. Useful for enviro...59.2LawVu Emails APIThe Emails API from LawVu — 5 operation(s) for emails.58.6Paragraph Emails APIThe emails API from Paragraph — 1 operation(s) for emails.58.3Axuall Email APIThe Email API from Axuall — 2 operation(s) for email.57.9Vanilla Forums Emails APIThe Emails API from Vanilla Forums — 3 operation(s) for emails.57.9Pipeliner CRM Email APIThe Email API from Pipeliner CRM — 50 operation(s) for email.57.8MixRank Email APIThe Email API from MixRank — 4 operation(s) for email.57.7MailerSend APIMailerSend API v1 provides RESTful endpoints for sending emails (single, bulk, scheduled), templates, domai...57.4MailerSend Email APIThe Email API from MailerSend — 1 operation(s) for email.57.4Marketo Emails APIEmail Controller57.3RevenueBase Email APIThe Email API from RevenueBase — 2 operation(s) for email.57.1Wunderkind Email APIEmail sending operations57.1IRONSCALES Emails APIThe Emails API from IRONSCALES — 1 operation(s) for emails.56.9Descope Email APIThe Email API from Descope — 10 operation(s) for email.56.4Zoom Mail APIThe Zoom Mail API enables developers to programmatically access and manage mailbox data including draft man...55.8Forsta Email APIThe Email API from Forsta — 4 operation(s) for email.55.7Mastercard Email APIThe Email API from Mastercard — 2 operation(s) for email.55.7Soracom Email API[Email addresses](/en/docs/email/)55.1Outlook Mail APIAPI for accessing and managing email, calendar, contacts, and tasks in Outlook.54.9AnyAPI Email APIThe email API from AnyAPI — 2 operation(s) for email.54.8Chorus.ai Emails APIThe Emails API from Chorus.ai — 3 operation(s) for emails.54.6OKKI Go Emails APIThe Emails API from OKKI Go (go.okki.ai) — 6 operations for batch and personalized cold-outreach email send...54.5Makinari Agents APIPer-agent HTTP endpoints — 48 documented operations under /api/agents/* covering chat (including a WebSocke...54.3
Developing 29 Usable, with meaningful gaps to close
DealHub Email APIThe Email API from DealHub — 1 operation(s) for email.54.2Resend Emails APIStart sending emails through the Resend API.54.1Insider Email APIThe Email API from Insider — 10 operation(s) for email.54.0Automattic Emails APIThe emails API from Automattic — 10 operation(s) for emails.53.9Street.co.uk Email APIThe Email API from Street.co.uk — 2 operation(s) for email.53.6FusionAuth Email APIThe Email API from FusionAuth — 5 operation(s) for email.52.3Scaleway Emails APIThis section lists your emails and shows you how to manage them.51.6Verisoul Email APIThe Email API from Verisoul — 1 operation(s) for email.51.1Oracle Eloqua Emails APICreate and manage email assets50.5Kaleyra Email APISend single and batch transactional email (Email API v2) with domain management, templates, webhooks, and d...50.3VaultRE Email APIOperations related to email50.3Optus SMS Suite REST Email APICompanion REST API to the SMS gateway for scheduling and sending plain-text transactional email over a sepa...50.1Nimble Messages APIMessage drafts — list and create draft messages. 2 operation(s).50.0uChecker Валидация Email APIПроверка email-адресов, управление задачами валидации, получение и скачивание результатов47.7Aptly Email APIThe Email API from Aptly — 2 operation(s) for email.47.5Kaltura Email APIThe email API from Kaltura — 1 operation(s) for email.47.4Val Town Emails APIEmails47.1Affinity Emails APIOperations about emails46.8StackOne Unified Marketing APIStackOne Unified Marketing API standardizes campaign management across platforms, streamlining messages (SM...46.6Aerones Email APIThe email API from Aerones — 4 operation(s) for email.46.5Nextiva Email APIEmail-related workitem operations46.4Unlock Protocol Email APIThe Email API from Unlock Protocol — 3 operation(s) for email.45.9SEON Email APIThe Email API from SEON — 1 operation(s) for email.45.4LendKey Email APIThe email API from LendKey — 2 operation(s) for email.44.5ClimateAI Email APIemail sending operations42.8Openprovider Email APIThe Email API from Openprovider — 2 operation(s) for email.41.2Greenspark Email APIThe Email API from Greenspark — 14 operation(s) for email.40.6Packet 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...40.0
Thin 29 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...38.6Apache James JMAP APIThe JMAP (JSON Meta Application Protocol) implementation in James provides a modern, efficient email protoc...38.5Wazo Emails APIThe emails API from Wazo — 5 operation(s) for emails.38.4Argo CD Notifications APIThe Argo CD Notifications subsystem delivers app lifecycle events (sync, health, deploy) to webhooks, Slack...38.1Spree Klaviyo IntegrationOfficial Klaviyo marketing-platform integration for Spree - syncs customers, orders, and product events to ...37.8Unisson Emails APIThe emails API from Unisson — 7 operation(s) for emails.37.0Appgain Notify APIThe messaging send service. A single POST /{projectId}/send endpoint whose channel is selected by the top-l...36.7Cloud Custodian C7n-Mailerc7n-mailer is a Cloud Custodian notification tool that subscribes to an SQS queue populated by policy actio...36.7Equinix Emails APIEmail Management36.6Maileroo Emails APISend transactional and bulk emails36.6Resourcly Email APIThe email API from Resourcly — 1 operation(s) for email.35.9Terminal Email APIThe Email API from Terminal — 1 operation(s) for email.35.9Sonatype Nexus Email APIThe Email API from Sonatype Nexus — 2 operation(s) for email.35.5ClickSend Email APISend and view transactional email.35.3microsoft-azure-communication-services Email APIThe Email API from microsoft-azure-communication-services — 1 operation(s) for email.34.9Global Relay Email APIEndpoints for archiving email messages34.8Xoxoday Reward Links APIAPI for creating and sending personalized reward links via email, SMS, or chat. Supports campaign managemen...34.3Bitmovin Emails APIThe Emails API from Bitmovin — 6 operation(s) for emails.34.2ORCID Email APIThe Email API from ORCID — 1 operation(s) for email.33.8Employee Automation APIA dedicated service that streamlines management of users and employee signature data inside an Email Experi...32.9Verify APIEmail verification API — single-address real-time validation and asynchronous CSV batch verification, sold ...32.9Escape Emails APIRead scan inbox emails. The public API provides endpoints to list inbox emails and read their raw content w...32.6lists.sr.ht GraphQL APIGraphQL API for managing mailing lists and email-based code review workflows on SourceHut, powered by git s...32.6Engagespot Notifications APIThe Engagespot REST API enables sending multi-channel notifications to users, listing and deleting notifica...31.5XSKY Emails APIEmailController Operations about Email31.5docomo Mail IMAP InterfaceThe docomo Mail IMAP interface is the one machine-interface specification NTT DOCOMO publishes openly, with...28.4Gandi Email APIThe Gandi Email API allows you to manage email accounts and mailboxes.27.5Primitive Emails APIList, inspect, and manage received emails27.1Airship Email & SMS APISend email and SMS messages alongside push.26.5
Emerging 12 Early or largely undocumented
Stensul Content APIEnterprise API for retrieving finalized Stensul email content and distributing it to any platform in a cust...25.6AgencyZoom Email APIThe Email API from AgencyZoom — 2 operation(s) for email.25.5GroupWise Administration REST APIREST/JSON administration API for a GroupWise system, served by the GroupWise Administration Service that in...25.3GroupWise Web Services (SOAP)Server-side SOAP protocol for reading and writing a GroupWise user's mailbox, spoken directly to the GroupW...25.3Stack Auth Emails APIThe Emails API from Stack Auth — 2 operation(s) for emails.24.1Lane API Email APIThe Email API from Lane API — 7 operation(s) for email.22.2Pushwoosh Messaging APISend push notifications, email, SMS and in-app messages to user audiences.22.0Bloomberg Email GatewayGateway service enabling Bloomberg IB messages to be sent and received via email for communication with cou...18.6LiqPay Invoice APIAPI for generating and sending payment invoices to customers by email or phone number. Invoices include ite...17.4SendinblueA service that provides solutions relating to marketing and/or transactional email and/or SMS15.5mxHERO Mail2Cloud Advanced (AI Email Knowledge)AI email knowledge-recovery service. Captured company email is optimized and stored in an isolated per-tena...15.1Buildium Communications APIManages emails, notes, and other communications stored against properties, leases, tenants, owners, and ven...14.0
Minimal 17 Almost no public developer surface
Postfix SMTPPostfix implements SMTP (RFC 5321) for sending and receiving electronic mail, with submission (port 587), S...9.1PostStackEU-hosted email API for transactional and marketing email, with contacts, broadcasts, and analytics8.3SAGARIS MCP ServerRead-only MCP server over Streamable HTTP (stateless JSON mode), workspace-key bearer auth, exposing 5 GET-...6.7SAGARIS REST APIREST API for the SAGARIS Agentic Revenue OS, including the Company Brain context endpoints. Bearer/workspac...6.7ImprovMXAPI for free email forwarding service5.6MailboxValidatorValidate email address to improve deliverability5.4Cloudmersive ValidateValidate international phone numbers5.1DisifyValidate and detect disposable and temporary email addresses5.1DropMailGraphQL API for creating and managing ephemeral e-mail inboxes5.1Email ValidationValidate email addresses for deliverability and spam5.1EmailJSSend emails directly from client-side JavaScript without a backend server5.1Guerrilla MailDisposable temporary Email addresses5.1mail.gw10 Minute Mail5.1mail.tmTemporary Email Service5.1MailCheck.aiPrevent users to sign up with temporary email addresses4.1VerifierVerifies that a given email is real4.1EVAValidate email addresses3.3

Companies reaching this through an API (115)

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.

Acquia Adobe Suite Aerones Affinity AgencyZoom Amazon Web Services AnyAPI Apollo.io Aptly Argo CD Auth0 Automattic Axuall Bitmovin Bloomberg Message Bloomreach Buildium Chorus.ai Clearbit (HubSpot Breeze Intelligence) ClimateAI Cloud Custodian Cloudflare Conga Cvent Cvent Event Cloud Cvent Hospitality Cloud Cvent Registration Datadog DealHub Descope DomScan Eclipse Foundation Encharge Equinix Escape Extole Fenergo FirstPromoter Forsta FusionAuth Genesys Global Relay Gravitee Greenspark HighLevel HubSpot Inflection.io Instantly IRONSCALES Kaleyra
Show all 115 companies ↓
Kaltura Keap Khoros KPN Lane API LawVu LendKey Lightfield LiqPay 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 Packet Host Paragraph 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 Vessel Wazo Xiaoman (OKKI) Xoxoday XSKY Zoho CRM Zoom

Score breakdown

Frequency
72.7
log-scaled weighted occurrences
Breadth
4.9
spread across providers
Quality lift
51.4
mean composite of providers using it
Cohesion
16.8
strength of nearest seed neighbor

Where this tag sits

188 providers carry this tag directly, and 308 counting the 7 narrower tags below — 120 more to reach.

SMTP 20 providers Email Marketing 81 providers Transactional Email 36 providers Email Security 33 providers Email Deliverability 8 providers Email Testing 6 providers Email Verification 35 providers

Related tags

SMS 62 co-occurrences Campaigns 49 co-occurrences Marketing Automation 43 co-occurrences Transactional Email 32 co-occurrences Contacts 57 co-occurrences Messaging 64 co-occurrences Email Marketing 30 co-occurrences

Where this tag comes from

Provider tag188
Api tag177
Openapi tag73
Openapi op tag233

Cohort brief

Auto-generated

The 180 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
180
all scored
Mean Kin Score
43.4
+20.5 vs catalog 22.9
Mean Agent Readiness
27.1
+15.2 vs catalog 11.9
Spread
0–93.2
median 45.6 · σ 24
How the 180 split by band
Exemplar 37Strong 33Developing 33Thin 30Emerging 21Minimal 26
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Access Clarity 51.3 26.5 +24.8 180
Operational Transparency 37.4 13.7 +23.7 180
Developer Ergonomics 45.1 23.2 +21.9 180
Contract Quality 37.6 17.6 +20 180
Discoverability 65.1 58.1 +7 180
Contract Governance 12.5 6.3 +6.2 180

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) 36% 14% +22
MCP server (first-party) 35% 12% +23
Agent Skills 0% 0% 0
OAuth scopes 24% 11% +13
Security 98% 98% 0
Arazzo workflows 8% 2% +6
Governance rules 29% 14% +15

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 Nylas 93.2
  2. 2 AhaSend 84.3
  3. 3 Customer.io 83.8
  4. 4 Infobip 82.4
  5. 5 SendGrid 82.4
  6. 6 Brevo 81.7
  7. 7 Amazon SES 80.5
  8. 8 Mailchimp 79.2
  9. 9 Amazon Pinpoint 78.9
  10. 10 Kit 78.5
Top by Agent Readiness
  1. 1 OneSignal 75.4
  2. 2 MoEngage 67.8
  3. 3 AgentMail 64.4
  4. 4 Infobip 63
  5. 5 Loops 62.9
  6. 6 Cordial 62.9
  7. 7 Paubox 61.5
  8. 8 beehiiv 61.2
  9. 9 Novu 60.7
  10. 10 Kit 60.4
All 188 members of this roster resolve to a scored provider in the catalog.Generated from the catalog build of 5 October 2026, across 29093 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"

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