YAM (short for Yet Another Mailer) is a commonly used MIME-compliant Internet mailer written for AmigaOS computers. It supports POP3, SMTP, TLSv1/SSLv3, multiple users, PGP, hierarchical folders, filters, a configurable GUI, an ARexx interface and more...
MrPostman is an email gateway from local POP clients like Microsoft Outlook, Mozilla's mailclient etc. to different web mail services like Yahoo and Hotmail.
It is being designed for extensibility so is easy to add more web mail services to it.
Aggregate RSS/Atom feeds trough your email. With Newpipe you can read, organize and archive news feeds with your current mailclient, without the need for a separate program.
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SPAMGrinderProxy is an SMTP and POP3 spam filter that runs as a service on Windows XP/2K. It works with any server or client, scanning each message for SPAM and flagging those that are. It can interoperate with SpamAssassin or use its own filters.
Qpopper is the most widely-used server for the POP3 protocol (this allows users to access their mail using any POP3 client). Qpopper supports the latest standards, and includes a large number of optional features.