All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).
The missing POP3 💌 server for Amazon Simple Email Service - written in golang.
Disposable webmail server (similar to Mailinator) with built in SMTP, POP3, RESTful servers; no DB required.