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...Supports POP3, APOP, IMAP, SMTP, SMTP AUTH, NNTP, LDAP, multiple accounts, spell-checking, addressbook, SSL, GPG, filtering, i18n, & more. It is further extended by plugins.
A nice system wide software to display notifications like Growl for Mac on Windows is Snarl fullphat.net.Find here various plugins and apps which add Snarl support to different apps
The Postfix http map type allows you to hook up Postfix to a server with HTTP protocol, such as apache lighttpd nginx, etc. You need to write a CGI with C CPP Perl PHP etc, to complete the HTTP protocol to your database proprietary protocol conversion.
mutt-mb is a program to create a list of mailboxes for the MUA mutt when mail is stored in maildir format. It can also be used to check the consistency of the mail storage.
SpamPal is a mail classification program that can help separate your spam from the mail you really want to read. SpamPal includes support for POP3, IMAP4 and SMTP accounts and can be extended by dozens of plugins and tools and is available in 6 languages
A milter (sendmail plugin with the ability to filter messages at the SMTP level) that lets each prospective recipient decide whether or not they want the message and rejects it if everyone agrees it's not wanted. Each user can examine the full message.
Unlimited organizations, 3 enterprise SSO connections, role-based access control, and pro MFA included. Dev and prod tenants out of the box.
Auth0's B2B Essentials plan gives you everything you need to ship secure multi-tenant apps. Unlimited orgs, enterprise SSO, RBAC, audit log streaming, and higher auth and API limits included. Add on M2M tokens, enterprise MFA, or additional SSO connections as you scale.
Patch / add-on for qmail, written in C and using PostgreSQL as database backend in order to implement an anti-spam method known as "greylisting". The patch behaves and performs nicely, while reducing resources needed for handling email traffic.
URLBody is a plugin for the Spampal program. URLBody checks the text in email messages for links to web sites, and marks those messages which link to blacklisted web sites as spam.
Mailcash if a plugin for Apple's Mail program that provides hashcash support - that is, verification and generation of hashcash stamps. Refer to <http://www.hashcash.org/> for more information about Hashcash.
Cronos II is a MUA (or Mail Client) written from scratch over the GNOME library using C. This MUA is intended to be fast, light and powerful. It has support for POP3, Spool, SMTP, Plugins and many other protocols and features.
Soco is a distributed social software which based on the eclipse and P2P technique. Seco will facilitate the communication of people. Based on this platform, people can share file, BBS, chat, send email,play games, make friends and so on.