canonical · 0.0 market domain

Email

Score 31.0 / 100 178 providers +77 via APIs 135 APIs Search apis.io →
Business capabilities this tag reaches
Information & Data Management 1
Variants seen in the corpus: EmailemailВалидация Email

Providers using this tag (178)

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

Exemplar 31 Complete, well-documented, and agent-ready
Customer.ioBehavioral DataBroadcastsCampaignsCDP4 APIs89.3BrevoMarketingMarketing AutomationEmail MarketingTransactional Email21 APIs87.3Salesforce Marketing CloudAutomationContent ManagementCustomer JourneyDigital Marketing1 API82.6AhaSendTransactional EmailDeveloper ToolsSMTP2 APIs82.3Amazon PinpointCampaignsCommunicationsMarketing2 APIs82.2BrazeCustomer EngagementMarketing AutomationMessagingPush Notifications1 API80.4OneSignalNotificationPushSMS2 APIs80.0SendGridEmail APIMarketing EmailSMTP44 APIs80.0KlaviyoMarketingSMSCustomer Data1 API79.1NylasCalendarCommunicationsContacts2 APIs76.6Amazon SESEmail DeliverabilityEmail ServiceMarketing Email2 APIs76.3InfobipTelecommunicationsCroatiaCPaaSMessaging47 APIs75.4Mapp Marketing CloudCompanyMarketingMarketing Automation4 APIs74.8PlunkTransactional EmailMarketingAutomation2 APIs74.6SendPulseMarketingMarketing AutomationTransactional Email20 APIs74.4AWeberEmail MarketingMarketing AutomationNewsletters4 APIs73.1IterableCross-Channel MessagingCustomer EngagementMarketing Automation2 APIs73.0TwilioAuthenticationCommunicationsContact Center40 APIs72.9OutreachSalesSales EngagementSequencesCRM2 APIs72.6MailboxlayerEmail VerificationEmail ValidationSMTP2 APIs71.9SMTP2GOEmail DeliveryTransactional EmailSMTP1 API71.7KnockNotificationMessagingInfrastructureWorkflows13 APIs71.6MoEngageCustomer EngagementMarketing AutomationCustomer Data PlatformPush Notifications30 APIs71.5PauboxHIPAAHealthcareCompliance3 APIs71.5beehiivNewsletterCreatorSubscription5 APIs71.2NovuNotificationMessagingIn-App1 API71.1OrttoMarketing AutomationCDPCustomer Data PlatformAnalytics1 API70.5HunterContact DiscoveryEmail VerificationLead Generation1 API69.8BlueshiftCustomer Data PlatformCustomer EngagementMarketing AutomationCross-Channel Messaging2 APIs69.3LoopsEmail APIMarketing AutomationTransactional Email1 API69.1ButtondownAnalyticsAutomationsMarkdown1 API67.3
Strong 28 Solid coverage with minor gaps
MoosendEmail MarketingMarketing AutomationCampaignsMailing Lists1 API65.8AcousticCompanyMarTechMarketingMarketing Automation2 APIs65.5Microsoft GraphAzure ADCollaborationContactsDocuments71 APIs64.1MailmodoInteractive EmailAMP for EmailMarketing Automation9 APIs63.7cPanelControl PanelDNSDomains2 APIs63.6Microsoft OutlookCalendarContactsEnterprise1 API63.3GladlyCustomer ServiceCXContact CenterAI Customer Service1 API62.7TempMailGrab APItemporary-emailDisposable EmailOTP1 API62.6Amazon SNSMessagingNotificationPub-Sub1 API62.4CordialCompanyMarketingMarketing AutomationMessaging2 APIs61.8DyspatchCompanyEmail TemplatesMarketing1 API61.4EmailOctopusEmail MarketingNewslettersCampaigns2 APIs61.1ExclaimerCompanyEmail SignaturesEmail Signature Management10 APIs61.1MailerSendTransactional EmailSMTPMarketing1 API60.6SalesloftSalesSales EngagementCadencesCRM1 API60.2WunderkindCompanyMarketingPersonalizationIdentity Resolution5 APIs59.7SalesflareCRMSalesB2BContacts2 APIs59.4Amazon WorkMailBusiness CommunicationCalendarExchange1 API59.0EvercontactCompanyContact ManagementContact DataData Enrichment1 API57.3Act-OnCompanyMarketingMarketing AutomationEmail Marketing8 APIs57.1SuprSendNotificationMulti-ChannelSMS1 API57.1InsiderCompanyCustomer EngagementPersonalizationCustomer Data Platform18 APIs57.0KickboxEmail VerificationEmail ValidationDeliverabilityData Quality2 APIs56.8LindyAI AgentsAI AutomationAgentic AIMCP1 API56.5Microsoft ExchangeCalendarCollaborationContacts6 APIs56.4ZavuCompanyMessagingSMSWhatsApp1 API56.1NationBuilderCommunity OrganizingCRMPoliticalNon-Profit1 API55.2Route MobileTelecommunicationsIndiaCPaaSMessaging5 APIs54.7
Developing 33 Usable, with meaningful gaps to close
ZohoAnalyticsCollaborationCRMCustomer Service267 APIs54.1ResendDeveloper ToolsTransactional EmailMarketing Email1 API53.5BluecoreCompanyRetailMarketingCustomer Data Platform3 APIs53.3HatchCompanyVertical SoftwareCustomer CommunicationConversational AI1 API53.3HiverCompanyCustomer ServiceHelp DeskShared Inbox1 API53.1MixmaxCompanySoftware-as-a-ServiceMCPAgents1 API51.4FynoNotificationMessagingCommunicationsPush Notifications1 API51.2Google WorkspaceCalendarCollaborationProductivity1 API50.6AgentMailCompanyArtificial IntelligenceAI Agents1 API50.5MagicBellNotificationPush NotificationsIn-App Notifications1 API50.4Movable InkCompanyMarketingPersonalization2 APIs48.6listmonkNewsletterMailing ListMarketing2 APIs48.0uCheckerEmail VerificationSMTPDNS1 API47.8EmailRepSecurityEmail ReputationThreat Intelligence1 API47.5Val TownDeveloper ToolsServerlessJavaScriptTypeScript1 API47.4FrontAppCompanyCommunicationsCustomer ServiceShared Inbox1 API47.0Help ScoutCustomer-SupportHelp DeskLive Chat25 APIs46.7MissiveTeam InboxCollaborationMessaging1 API46.4CommsHarborTransactional EmailEmail MarketingCommunications1 API45.6LoopsMarketing EmailTransactional EmailEmail Automation1 API45.4SparkPostTransactional EmailMarketing EmailEmail Delivery10 APIs45.4ConversicaCompanyArtificial IntelligenceConversational AIAI Agents1 API44.2GOV.UK NotifyNotificationSMSText Messages1 API43.7AOLDigital MediaNewsEntertainmentAdvertising1 API43.6Google GmailDraftsGmailGoogle1 API43.6MailjetEmail DeliveryMarketing EmailSMTP1 API43.4Return PathCompanyMarTechEmail Deliverability11 APIs42.6BirdCommunicationsSMSWhatsApp6 APIs42.5FrontCustomer-SupportInboxCustomer Operations2 APIs41.3Zoho MailMailCollaborationMessaging1 API40.8WhippyCommunicationsMessagingSMS1 API40.5TucowsCompanyInfrastructureDomainsDNS2 APIs40.2MailtrapEmail DeliveryEmail SandboxEmail Testing2 APIs39.7
Thin 28 Limited public surface area
MailerooEmail DeliveryMarketing EmailSMTP1 API38.9Apache JamesIMAPJavaJMAP1 API38.6AppgainCompanyMobile MarketingMarketing AutomationOmnichannel Messaging3 APIs38.2ClickSendCommunicationsSMSMMSVoice1 API37.9StaffbaseCompanyEmployee CommunicationsInternal CommunicationsEmployee Experience1 API37.6Ocean SecurityCompanySecurityEmail SecurityCybersecurity1 API37.3Microsoft 365ProductivityCollaborationCalendar1 API37.1SubstackNewslettersPublishingCreator EconomySubscription3 APIs37.1NotificationAPINotificationMessagingSMS1 API36.9SEDNACompanyShippingMaritime1 API36.7JeengCompanyAdvertisingPublishing6 APIs36.1MailPaceTransactional EmailMessagingSMTP1 API35.8FormspreeFormsBackendStatic Sites1 API35.7CourierNotificationSMSPush1 API35.4PreVeilEncryptionEnd-to-End EncryptionFile Sharing35.3Office 365CloudCollaborationDocuments5 APIs34.6MailgunTransactional EmailSMTPEmail Validation1 API33.0PushCompanyCRMCustomer Data PlatformMarketing Automation1 API33.0EngagespotNotificationIn-App NotificationsPush Notifications1 API32.9TerminusCompanyAccount Based MarketingMarketingAdvertising3 APIs31.1KnockNotificationSMSPush1 API30.9ProofpointSecurityCybersecurityEmail SecurityThreat Intelligence7 APIs30.6GandiDNSDomainsDomain Registrar2 APIs29.4MacroCompanyProductivityCollaboration1 API28.7ClickSend SMSSMSMMSMessagingVoice1 API27.9VirtualminCompanyWeb HostingControl PanelServer Management1 API27.9EmailEngineEmail APIIMAPSMTP13 APIs27.1AirshipNotificationPushMobile1 API26.2
Emerging 26 Early or largely undocumented
Opensense (formerly SenderGen)CompanyEmail Signature ManagementEmail MarketingBrand Management26.0SuperhumanCompanyProductivityArtificial Intelligence25.8ResulticksCompanyMarketingMarketing AutomationOmnichannel1 API25.3ZimbraCollaborationCalendarMessaging1 API25.3NovellCompanyEnterprise SoftwareCollaboration3 APIs24.5StensulCompanyEmail MarketingMarketing2 APIs24.3PushwooshNotificationPushSMS1 API22.9ShortwaveCompanyEmail ClientArtificial Intelligence22.9InboxInboxMessagingDeliverability2 APIs21.4LavenderCompanySalesArtificial Intelligence18.6SendinbluePublic APIs1 API18.6SupafaxCompanyCalendarAI Assistant18.1LevityCompanyArtificial IntelligenceLogisticsSupply Chain18.0NameSiloDomainsDomain RegistrarDNSHosting1 API17.0AegisAICompanyArtificial IntelligenceEmail SecurityCybersecurity16.2SpikeCompanyCollaborationTeam Chat16.0mxHeroCompanyCloud StorageContent Management1 API15.9BuildforeverCompanyArtificial IntelligenceConsumer15.8YampaCompanyAi MlAI AgentsCustomer Service15.7Robylon AICustomer-SupportAI AgentsConversational AIVoice1 API14.3SMTPSMTPInternet StandardsIETF2 APIs14.0410 LabsCompanyProductivityInbox Management13.6AvecCompanyProductivityArtificial Intelligence12.8BoomerangCompanyProductivityScheduling12.7NumeroCompanyEnterprise SaasPolitical CampaignsFundraising12.1INBOTIQACompanyShared InboxWorkflows11.9
Minimal 26 Almost no public developer surface
Network SolutionsCompanyDomainsDomain RegistrationDomain Registrar10.4TheSkimmCompanyConsumerMediaNewsletter10.2PostfixMail ServerMTASMTP1 API9.9Goomp Inc, Kalendar AICompanyArtificial IntelligenceSalesSales Automation1 API9.8PostStackPublic APIs1 API9.2ImprovMXPublic APIs1 API8.1Cloudmersive ValidatePublic APIs2 APIs7.6DisifyPublic APIs1 API7.6DropMailPublic APIs1 API7.6Email ValidationPublic APIs1 API7.6EmailJSPublic APIs1 API7.6Guerrilla MailPublic APIs1 API7.6mail.gwPublic APIs1 API7.6mail.tmPublic APIs1 API7.6MailboxValidatorPublic APIs1 API7.6TripScoutCompanyTravelTravel DealsFlights7.6TownCompanyArtificial IntelligenceAgentsPersonal Assistant7.3EVAPublic APIs1 API6.7MailCheck.aiPublic APIs1 API6.7VerifierPublic APIs1 API6.7EmailioCompanyEmail ClientProductivity6.0AcompliCompanyMobileProductivity5.0BoomTrainCompanyMarketingPersonalizationMachine-Learning5.0HotmailCompanyWebmailConsumer5.0SigstrCompanyEmail SignatureMarketing5.0XimianCompanyOpen-SourceLinuxGNOME5.0
Unrated 6 Not yet scored
AdKnowledgeCompanyConsumerAdvertisingMarketingBrightmailCompanyAnti-SpamEmail SecurityHabeasCompanyEmail DeliverabilityEmail ReputationIMAPIMAPMessagingProtocolRapportiveCompanyContact IntelligenceGmailVerioCompanyWeb HostingInternet Service ProviderDomains

APIs with this tag (134)

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 18 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...87.5HubSpot Automation Email Templates APIHubSpot Automation Email Templates — 5 operation(s) from HubSpot's published OpenAPI.87.1Content Builder APIREST API for creating and manipulating marketing content in Content Builder, a single cross-channel reposit...82.6Email Send Definition APIAPI for creating and managing email send definitions, which define the configuration for sending emails to ...82.6AhaSend Email APIAPIs for sending emails82.3Optimizely Email APIThe Email API from Optimizely — 3 operation(s) for email.77.4Amazon SES Email APIThe Email API from Amazon SES — 60 operation(s) for email.76.3Acquia Email APIThe Email API from Acquia — 1 operation(s) for email.75.8Adobe Campaign APIManage marketing campaigns, deliveries, workflows, subscriptions, and profiles through REST APIs for cross-...75.6Microsoft Azure Communication Services APIAzure Communication Services provides multichannel communication APIs that enable developers to add voice, ...73.3Iterable Email APISend transactional emails and manage email-specific delivery settings.73.0Paubox MCP ServerHosted Model Context Protocol server exposing 30 Paubox tools across email, forms and email marketing to MC...71.5Postmark Email APIThe Email API from Postmark — 4 operation(s) for email.71.3SAP Emarsys Email APIThe Email API from SAP Emarsys — 34 operation(s) for email.71.0Loops MCP ServerRemote Model Context Protocol server for Loops, reachable at https://mcp.loops.so over Streamable HTTP with...69.1Loops WebhooksOutbound event surface. Seventeen signed event types covering contact lifecycle, mailing-list membership, a...69.1Buttondown Newsletter PlatformThe Buttondown hosted newsletter platform provides a markdown-based composition experience, subscriber mana...67.3Bloomreach Engagement APIREST API for the Bloomreach Engagement marketing automation and CDP platform, enabling customer tracking, s...67.2
Strong 34 Solid coverage with minor gaps
Instantly Email APIA campaign email, a reply, a manually sent email, or any other email that's visible in the Unibox65.7Infusionsoft (Keap) Email APIEmails-Endpoint65.2Cloudflare Email Routing APIThe Cloudflare Email Routing API enables developers to create and manage custom email addresses and routing...65.1Keap Email APIKeap Email API — 10 operations across 8 paths on the Keap REST v2 contract, read from Keap's own published ...65.0Extole Email APIThe Email API from Extole — 7 operation(s) for email.63.8cPanel UAPIThe cPanel User API (UAPI) is the modern HTTP API for cPanel-account operations — email accounts, mailboxes...63.6Encharge Email Templates APIThe Email Templates API from Encharge — 9 operation(s) for creating and versioning email templates.63.2Encharge Transactional Email APIREST API for sending transactional emails through Encharge. Accepts JSON at POST /v1/emails/send with exact...63.2Conga Email APIThis controller provides access to email operations like sending email in post delivery.62.6TempMailGrab REST APIVersioned v1 REST API for creating private disposable inboxes, reading parsed messages with extracted OTPs ...62.6KPN Email-to-SMS APIConverts inbound email into SMS messages delivered over the KPN network. Documented on the KPN Developer po...62.4Eclipse Membership Application APIREST API backing the Eclipse Foundation membership application forms — form creation, contacts, organizatio...61.5ServiceNow Email APIThe ServiceNow Email API provides REST endpoints for sending email messages from the Now Platform. It allow...60.7MailerSend APIMailerSend API v1 provides RESTful endpoints for sending emails (single, bulk, scheduled), templates, domai...60.6MailerSend Email APIThe Email API from MailerSend — 1 operation(s) for email.60.6ThingSpeak Alerts APISend email alerts from a channel via the alerts API or React, and retrieve alert history. Useful for enviro...60.6Microsoft Email APISend email messages60.4Clearbit Risk APIScores an email address for fraud and abuse risk. Endpoint /v1/calculate?email=. Verified live 2026-08-13 (...60.3OCI Email Delivery APIREST APIs for sending high-volume and application-generated emails through Oracle Cloud Infrastructure, wit...60.2Apollo.io Emailer Messages APIOne-off email drafting, sending, send status and content retrieval. 4 operation(s) from the published Apoll...60.1Lithium Email APIThe Email API from Lithium — 1 operation(s) for email.59.7Wunderkind Email APIEmail sending operations59.7Nutshell Emails APIIndividual email messages recorded against Nutshell records. 1 operation(s) across 1 path(s).58.5Mastercard Email APIThe Email API from Mastercard — 2 operation(s) for email.58.2RB2B Enrichment APICredit-metered Enrichment endpoints that take a known identifier — hashed email (MD5), plaintext email, or ...58.2Stytch Email APIThe Email API from Stytch — 3 operation(s) for email.58.2Grafana Email APIThe Email API from Grafana — 3 operation(s) for email.57.5RevenueBase Email APIThe Email API from RevenueBase — 2 operation(s) for email.57.3MixRank Email APIThe Email API from MixRank — 4 operation(s) for email.57.1Insider Email APIThe Email API from Insider — 10 operation(s) for email.57.0Gravitee email APIThe email API from Gravitee — 4 operation(s) for email.56.8ECI Notification APIMessage notification delivery for ECI products over email (AWS SES) and in-app REST or WebSocket channels. ...56.6ECI Office Integration APIMicrosoft 365 integration for ECI products: drive files, mail and calendar for the signed-in user, with nex...56.6Descope Email APIThe Email API from Descope — 10 operation(s) for email.56.4
Developing 29 Usable, with meaningful gaps to close
Soracom Email API[Email addresses](/en/docs/email/)54.1Zoho MailThe Zoho Mail REST API allows developers to fetch email conversations and integrate Zoho Mail into applicat...54.1Street.co.uk Email APIThe Email API from Street.co.uk — 2 operation(s) for email.54.0Makinari Agents APIPer-agent HTTP endpoints — 48 documented operations under /api/agents/* covering chat (including a WebSocke...53.9Kaleyra Email APISend single and batch transactional email (Email API v2) with domain management, templates, webhooks, and d...53.7Resend Email APIThe Email API from Resend — 3 operation(s) for email.53.5Zoom Mail APIThe Zoom Mail API enables developers to programmatically access and manage mailbox data including draft man...53.3Optus SMS Suite REST Email APICompanion REST API to the SMS gateway for scheduling and sending plain-text transactional email over a sepa...52.6DealHub Email APIThe Email API from DealHub — 1 operation(s) for email.52.5Outlook Mail APIAPI for accessing and managing email, calendar, contacts, and tasks in Outlook.51.8Gmail APISend and read email, manage drafts and labels, and handle mailbox settings.50.6Gmail Postmaster Tools APIGather statistics on bulk emails sent to Gmail users including spam reports and delivery errors.50.6VaultRE Email APIOperations related to email49.9Nextiva Email APIEmail-related workitem operations49.8Verisoul Email APIThe Email API from Verisoul — 1 operation(s) for email.49.5Nimble Messages APIMessage drafts — list and create draft messages. 2 operation(s).48.8LendKey email APIThe email API from LendKey — 2 operation(s) for email.48.3uChecker Валидация Email APIПроверка email-адресов, управление задачами валидации, получение и скачивание результатов47.8Aptly Email APIThe Email API from Aptly — 2 operation(s) for email.47.6Kaltura email APIThe email API from Kaltura — 1 operation(s) for email.47.3StackOne Unified Marketing APIStackOne Unified Marketing API standardizes campaign management across platforms, streamlining messages (SM...46.9Unlock Protocol Email APIThe Email API from Unlock Protocol — 3 operation(s) for email.46.9SEON Email APIThe Email API from SEON — 1 operation(s) for email.46.0CommsHarbor APIREST/HTTP API (OpenAPI 3.1) for transactional email, deliverability, sending domains, permission-based mark...45.6FusionAuth Email APIThe Email API from FusionAuth — 5 operation(s) for email.42.8ClimateAI Email APIemail sending operations42.3Greenspark Email APIThe Email API from Greenspark — 14 operation(s) for email.41.1OpenSRS Email API (OMA)The OpenSRS Mail API is the provisioning interface for the OpenSRS hosted email system — create, modify and...40.2Spree Klaviyo IntegrationOfficial Klaviyo marketing-platform integration for Spree - syncs customers, orders, and product events to ...39.6
Thin 22 Limited public surface area
Argo CD Notifications APIThe Argo CD Notifications subsystem delivers app lifecycle events (sync, health, deploy) to webhooks, Slack...39.2Terminal Email APIThe Email API from Terminal — 1 operation(s) for email.39.0Apache James JMAP APIThe JMAP (JSON Meta Application Protocol) implementation in James provides a modern, efficient email protoc...38.6Appgain Notify APIThe messaging send service. A single POST /{projectId}/send endpoint whose channel is selected by the top-l...38.2ClickSend Email APISend and view transactional email.37.9Xoxoday Reward Links APIAPI for creating and sending personalized reward links via email, SMS, or chat. Supports campaign managemen...37.8microsoft-azure-communication-services Email APIThe Email API from microsoft-azure-communication-services — 1 operation(s) for email.37.0Cloud Custodian C7n-Mailerc7n-mailer is a Cloud Custodian notification tool that subscribes to an SQS queue populated by policy actio...36.7Qlik Email Configuration APIManages email transport configuration for sending notifications and reports from Qlik Cloud.36.6lists.sr.ht GraphQL APIGraphQL API for managing mailing lists and email-based code review workflows on SourceHut, powered by git s...35.9Global Relay Email APIEndpoints for archiving email messages35.7Openprovider Email APIThe Email API from Openprovider — 2 operation(s) for email.35.5Resourcly email APIThe email API from Resourcly — 1 operation(s) for email.35.1ORCID Email APIThe Email API from ORCID — 1 operation(s) for email.35.0Outlook Mail APIAccess email, manage folders, send mail, and manage mail settings via Microsoft Graph.34.6Sonatype Nexus Email APIThe Email API from Sonatype Nexus — 2 operation(s) for email.33.4Engagespot Notifications APIThe Engagespot REST API enables sending multi-channel notifications to users, listing and deleting notifica...32.9Employee Automation APIA dedicated service that streamlines management of users and employee signature data inside an Email Experi...31.1Verify APIEmail verification API — single-address real-time validation and asynchronous CSV batch verification, sold ...31.1docomo Mail IMAP InterfaceThe docomo Mail IMAP interface is the one machine-interface specification NTT DOCOMO publishes openly, with...29.7Gandi Email APIThe Gandi Email API allows you to manage email accounts and mailboxes.29.4Airship Email & SMS APISend email and SMS messages alongside push.26.2
Emerging 14 Early or largely undocumented
AgencyZoom Email APIThe Email API from AgencyZoom — 2 operation(s) for email.25.9GroupWise Administration REST APIREST/JSON administration API for a GroupWise system, served by the GroupWise Administration Service that in...24.5GroupWise Web Services (SOAP)Server-side SOAP protocol for reading and writing a GroupWise user's mailbox, spoken directly to the GroupW...24.5Stensul Content APIEnterprise API for retrieving finalized Stensul email content and distributing it to any platform in a cust...24.3Lane API Email APIThe Email API from Lane API — 7 operation(s) for email.23.8Pushwoosh Messaging APISend push notifications, email, SMS and in-app messages to user audiences.22.9Mailgun Email APIMailgun provides a programmable email API for sending, receiving, tracking, and validating email at scale. ...21.4Nylas Email APINylas exposes a unified REST API for email, calendar, contacts, and scheduling across Google, Microsoft, iC...21.4Bloomberg Email GatewayGateway service enabling Bloomberg IB messages to be sent and received via email for communication with cou...19.1SendinblueA service that provides solutions relating to marketing and/or transactional email and/or SMS18.6LiqPay Invoice APIAPI for generating and sending payment invoices to customers by email or phone number. Invoices include ite...18.3Amazon Web Services Email APIThe Email API from Amazon Web Services — 96 operation(s) for email.17.4Buildium Communications APIManages emails, notes, and other communications stored against properties, leases, tenants, owners, and ven...16.4mxHERO Mail2Cloud Advanced (AI Email Knowledge)AI email knowledge-recovery service. Captured company email is optimized and stored in an isolated per-tena...15.9
Minimal 17 Almost no public developer surface
Postfix SMTPPostfix implements SMTP (RFC 5321) for sending and receiving electronic mail, with submission (port 587), S...9.9PostStackEU-hosted email API for transactional and marketing email, with contacts, broadcasts, and analytics9.2SAGARIS MCP ServerRead-only MCP server over Streamable HTTP (stateless JSON mode), workspace-key bearer auth, exposing 5 GET-...9.1SAGARIS REST APIREST API for the SAGARIS Agentic Revenue OS, including the Company Brain context endpoints. Bearer/workspac...9.1ImprovMXAPI for free email forwarding service8.1Cloudmersive ValidateValidate international phone numbers7.6DisifyValidate and detect disposable and temporary email addresses7.6DropMailGraphQL API for creating and managing ephemeral e-mail inboxes7.6Email ValidationValidate email addresses for deliverability and spam7.6EmailJSSend emails directly from client-side JavaScript without a backend server7.6Guerrilla MailDisposable temporary Email addresses7.6mail.gw10 Minute Mail7.6mail.tmTemporary Email Service7.6MailboxValidatorValidate email address to improve deliverability7.6EVAValidate email addresses6.7MailCheck.aiPrevent users to sign up with temporary email addresses6.7VerifierVerifies that a given email is real6.7

Companies reaching this through an API (77)

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 AgencyZoom Amazon Web Services Apollo.io Aptly Argo CD Bloomberg Message Bloomreach Buildium Clearbit (HubSpot Breeze Intelligence) ClimateAI Cloud Custodian Cloudflare Conga DealHub Descope ECI Solutions Eclipse Foundation Encharge Extole FusionAuth Global Relay Grafana Gravitee Greenspark HubSpot Infusionsoft (Keap) Instantly Kaleyra Kaltura Keap KPN Lane API LendKey LiqPay Lithium Mastercard Microsoft Microsoft Azure Microsoft Azure Communication Services Microsoft Office MixRank Nextiva Nimble NTT Docomo Nutshell Openprovider Optimizely Optus
Show all 77 companies ↓
Oracle ORCID Postmark Qlik RB2B Resourcly RevenueBase SAGARIS Salesforce SAP Emarsys SEON ServiceNow Sonatype Nexus Soracom SourceHut Spree Commerce StackOne Street.co.uk Stytch Terminal ThingSpeak Uncodie (now Makinari) Unlock Protocol VaultRE Verisoul Xoxoday Zoom

Score breakdown

Frequency
70.4
log-scaled weighted occurrences
Breadth
4.9
spread across providers
Quality lift
47.3
mean composite of providers using it
Cohesion
18.1
strength of nearest seed neighbor

Related tags

SMS 62 co-occurrences Transactional Email 32 co-occurrences Messaging 65 co-occurrences Marketing Automation 34 co-occurrences Contacts 46 co-occurrences Campaigns 37 co-occurrences Message 39 co-occurrences SMTP 21 co-occurrences

Where this tag comes from

Provider tag178
Api tag134
Openapi tag44
Openapi op tag166

Cohort brief

Auto-generated

The 168 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
168
all scored
Mean Kin Score
42.6
+18.7 vs catalog 23.9
Mean Agent Readiness
25.6
+13.6 vs catalog 12
Spread
5–89.3
median 43.5 · σ 23
How the 168 split by band
Exemplar 31Strong 28Developing 33Thin 28Emerging 26Minimal 22
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Access Clarity 48.3 26.5 +21.8 168
Operational Transparency 35.7 14 +21.7 168
Developer Ergonomics 43.8 23.4 +20.4 168
Contract Quality 39.9 19.8 +20.1 168
Discoverability 67.9 61.2 +6.7 168
Contract Governance 11.2 6.4 +4.8 168

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) 29% 10% +19
MCP server (first-party) 33% 13% +20
Agent Skills 0% 0% 0
OAuth scopes 23% 11% +12
Security 97% 97% 0
Arazzo workflows 7% 2% +5
Governance rules 24% 14% +10

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 Customer.io 89.3
  2. 2 Brevo 87.3
  3. 3 Salesforce Marketing Cloud 82.6
  4. 4 AhaSend 82.3
  5. 5 Amazon Pinpoint 82.2
  6. 6 Braze 80.4
  7. 7 OneSignal 80
  8. 8 SendGrid 80
  9. 9 Klaviyo 79.1
  10. 10 Nylas 76.6
Top by Agent Readiness
  1. 1 OneSignal 75.4
  2. 2 MoEngage 67.8
  3. 3 Loops 62.9
  4. 4 Cordial 62.9
  5. 5 Customer.io 62.1
  6. 6 Paubox 61.5
  7. 7 beehiiv 61.2
  8. 8 Nylas 59.3
  9. 9 Knock 58.6
  10. 10 Salesforce Marketing Cloud 57.9
All 178 members of this roster resolve to a scored provider in the catalog.Generated from the catalog build of 15 September 2026, across 27661 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

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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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