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
Mailx is a library that makes it easier to send email via SMTP. It is an enhancement of the golang standard library
Very simple package to send emails with SMTP Keep Alive and two timeouts: Connect and Send
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
A library to generate nice email templates working on any mail client
Full-featured mail server solution based on Postfix and Dovecot
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