Send email
Send transactional email and manage email delivery.
Services are ordered by documented operations, attributed reports and current documentation. 34 interfaces are classified here. Each card shows the interfaces a service offers; open it for access requirements and sources.
Categories · Tasks · Interfaces · How listings are checked
Brevo
A unified REST API for sending messages across email, SMS, and WhatsApp
Communications
API · Documentation checked: 2026-10-08MCP · Documentation checked: 2026-10-07API · Access documentation verifiedPostmark
Transactional email delivery service for developers with a REST API, SMTP, templates and webhooks.
Communications · Developer tools
API · Access documentation verifiedNylas
Email, calendar and contacts API platform with an official CLI and MCP server for AI agents.
Communications · Developer tools · Productivity and collaboration
MCP · Access documentation verifiedCLI · Access documentation verifiedAPI · Access documentation verifiedMailgun
Email API service for developers to send, receive and track email, with a REST API and a local MCP server.
Communications · Developer tools
MCP · Access documentation verifiedAPI · Access documentation verifiedResend
Email API for developers to send transactional and marketing email, with SDKs, a CLI and a hosted MCP server.
Communications · Developer tools
MCP · Access documentation verifiedAPI · Access documentation verifiedInfobip
Infobip offers a messaging API for sending SMS messages and receiving delivery reports.
Communications · Communications · api
API · Access documentation verifiedSMTP2GO
Email delivery service with a REST API for sending a JSON email message.
Communications · Developer tools · API
API · Access documentation verifiedMailtrap
Mailtrap provides an Email API for sending transactional and bulk application emails from a verified sending domain.
Communications · Developer tools
API · Access documentation verifiedSendLayer
Send a transactional email through SendLayer's authenticated email API after authorizing a sending domain.
Communications
API · Access documentation verifiedMailerSend
MailerSend Email API for sending an asynchronous email and receiving its message identifier.
Communications · api
API · Access documentation verifiedTwilio
Communications platform with APIs for SMS, voice, WhatsApp, email and verification, plus a command-line interface.
Communications · Developer tools
CLI · Access documentation verifiedAPI · Access documentation verifiedVonage
Communications APIs for messaging, voice, video, verification and identity.
Communications · Developer tools
API · Access documentation verifiedOpenRouter
Unified API and MCP server for accessing many AI models from different providers.
Developer tools · ai models
API · Access documentation verifiedMCP · Access documentation verifiedGumloop
Gumloop’s Start Agent API sends a natural-language message to a selected agent and begins an asynchronous interaction.
automation · ai · Developer tools
API · Documentation checked: 2026-10-10ReplyLayer
ReplyLayer provides scoped email infrastructure for AI agents through REST, CLI, SDK, and MCP interfaces, with security scanning on messages.
Communications · api · mcp · Developer tools
MCP · Documentation checked: 2026-10-10TextMagic
A business messaging platform with an SMS REST API for sending text messages to phone numbers and contact lists.
Communications · sms · api
API · Documentation checked: 2026-10-10SMTPfast
SMTPfast provides a transactional email API with REST and SMTP interfaces for developers.
Communications · Communications · Developer tools
API · Documentation checked: 2026-10-12Blink
Frontline workforce communication platform with APIs for creating chats and connecting workplace applications.
communication · workforce · Communications
API · Documentation checked: 2026-10-10Plivo
Plivo provides a communications platform with an API for sending SMS messages.
Communications · Developer tools
API · Documentation checked: 2026-10-09PostStack
EU-hosted transactional email service with REST, SDK, SMTP, and MCP interfaces for sending and managing email.
Communications · Developer tools · Communications
API · Documentation checked: 2026-10-10The SMS Works
The SMS Works provides an SMS API; the documented message-send operation accepts an authenticated JSON message request.
Communications · sms · api
API · Documentation checked: 2026-10-11Courier
Send product notifications and transactional messages through Courier’s messaging API.
Communications · Developer tools
API · Documentation checked: 2026-10-09uChecker
uChecker validates email addresses using DNS/MX and SMTP checks and offers a web cabinet, API, and Telegram bot.
email-validation · Developer tools
API · Documentation checked: 2026-10-09Mailosaur
Mailosaur lists the virtual SMTP servers available to an authenticated account.
Developer tools · Communications
API · Documentation checked: 2026-10-11