259+ email tools for developers — transactional APIs, newsletter platforms, and drip campaigns. Alternatives to Mailchimp and SendGrid.
Lightweight SMTP client providing an HTTP API
A microservice to send emails using [MRML](https://github.com/jdrouet/mrml) templates
Very simple package to send emails with SMTP Keep Alive and two timeouts: Connect and Send
Mailx is a library that makes it easier to send email via SMTP. It is an enhancement of the golang standard library
Configurable Golang email validator/verifier. Verify email via Regex, DNS, SMTP and even more
SMTP server protocol state machine
Turns any Ubuntu server into a fully functional mail server with one command
an SMTP-library [](https://github.com/lettre/lettre/actions/workflows/test.yml)
Batteries-included IMAP client with auto-reconnect, OAuth2, IDLE support, and built-in MIME parsing
Receive form submissions by email
A library to generate nice email templates working on any mail client
Lets you have an infinite number of unique inboxes