pop3
Transparently add OAuth 2.0 support to IMAP/POP/SMTP client applications, scripts or any other email use-cases that don't support this authentication method.
An IMAP/POP/SMTP proxy that transparently adds OAuth 2.0 authentication for email clients that don't support this method. Keep legacy email clients working with Exchange Online, Gmail and other providers.
The free and open source email and collaboration software .
Related contents:
getmail 6 is a flexible, extensible mail retrieval system with support for POP3, IMAP4, SSL variants of both, maildirs, mboxrd files, external MDAs, arbitrary message filtering, single-user and domain-mailboxes, and many other useful features.
complete mail server SMTP + IMAP + POP3 + Antispam + Antivirus Web administration + Web email ...on your server in ~5 minutes
GreenMail is an open source, intuitive and easy-to-use test suite of email servers for testing purposes.
Typical use cases include mail integration testing or a lightweight sand boxed mail server for development. GreenMail is the first and only library that offers a test framework for both receiving and retrieving emails from Java.