Email APIs
Transactional and inbound email APIs, inboxes for agents, and email infrastructure.
JSON: /api/v1/directory.json (filter on category=email-apis)
Resend
Developer-focused email sending API with a free tier and official SDKs.
Free tierAPI keySendGrid
Twilio's transactional and marketing email service with a REST API.
Free tierAPI keyPostmark
Transactional email with a reputation for fast, reliable delivery and clear logs.
PaidAPI keyMailgun
Email API for sending, receiving and parsing messages programmatically.
Free tierAPI keyAgentMail
Email inboxes created through an API specifically so agents can send and receive mail.
Free tierAPI keyGmail API
Read, send and label Gmail messages on a user's behalf through OAuth.
FreeOAuthCloudflare Email Routing
Free custom-domain addresses that forward to an inbox or run through an Email Worker.
FreeAPI keyAmazon SES
Low-cost bulk and transactional email from AWS.
PaidOAuthBrevo
Email, SMS and marketing automation APIs.
Free tierAPI keyMailjet
Email delivery and campaign API.
Free tierAPI keySparkPost
High-volume email delivery API from Bird.
PaidAPI keyLoops
Email platform for SaaS with transactional and marketing sends.
Free tierAPI keyPlunk
Open-source email platform for transactional and marketing mail.
Free tierAPI keyNylas
Unified API for email, calendar and contacts across providers.
PaidAPI keyMicrosoft Graph Mail
Microsoft Graph endpoints for Outlook mail.
FreeOAuthMailchimp Transactional (Mandrill)
Transactional email add-on to Mailchimp.
PaidAPI keyImprovMX
Email forwarding service with API.
Free tierAPI keyMaileroo
Transactional email API.
Free tierAPI keyForward Email
Open-source email forwarding and hosting with API.
Free tierAPI keyEmailEngine
Self-hosted email API for IMAP and SMTP accounts.
PaidAPI keyInbound
Receive and process inbound email via API.
Free tierAPI key