emersion/go-message

✉️ A streaming Go library for the Internet Message Format and mail messages

emersion/go-imap

📥 An IMAP library for Go clients and servers

emersion/go-smtp

📤 An SMTP library for Go clients and servers

emersion/go-msgauth

🔏 A Go library and tools for DKIM, DMARC and Authentication-Results

emersion/go-ical

An iCalendar library for Go

emersion/go-sasl

🔑 A SASL library written in Go

wneessen/go-mail

📧 Easy to use, yet comprehensive library for sending mails with Go

rspamd/rspamd

Rapid spam filtering system.