Email Go Libraries Ranking

- Email and SMTP testing with web and API interface.

- Email and SMTP testing tool for developers.

- All-in-one (SMTP, IMAP, DKIM, DMARC, MTA-STS, DANE) email server

- Modern full-featured secure mail server for low-maintenance, self-hosted email.

- Golang package that generates clean, responsive HTML e-mails.

- A robust and flexible email library for Go.

- IMAP library for clients and servers.

- A Go library for email verification without sending any emails.

- A simple Go library for sending mails in Go.

- SendGrid's Go library for sending email.

- Go library for sending mail with the Mailgun API.

- Very simple package to send emails with SMTP Keep Alive and two timeouts: Connect and Send.

- Streaming library for the Internet Message Format and mail messages.

- CSS inliner for your HTML emails.

- Lightweight SMTP client providing an HTTP API.

- Inline styling for HTML mail in Go.

- Lightweight configurable multithreaded fake SMTP server. Mimic any SMTP behaviour for your test environment.

- Send encrypted emails to blockchain addresses written in Go.

- Configurable Golang email validator/verifier. Verify email via Regex, DNS, SMTP and even more.

- Batteries-included IMAP client with auto-reconnect, OAuth2, IDLE support, and built-in MIME parsing.

- DKIM library, to sign & verify email.

- Golang library for providing a canonical representation of email address.

- SMTP server protocol state machine.

- Mailx is a library that makes it easier to send email via SMTP. It is an enhancement of the golang standard library `net/smtp`.

- Validate email addresses before they hit your database: syntax, MX lookup, disposable domains, and role-based inboxes.

- Client for Postmark's SpamCheck API that scores a raw email against SpamAssassin rules.