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Cyrus IMAPd is a popular IMAP server that surfaces a rich interface for extending its functionality. The Cyrus IMAPd Utilities project brings together maintenance utilities, graphical front-ends, and API handlers (such as notification daemons).
Encode/Decode library to/from Basic Encoding Rules (BER) of ASN.1 written in Visual Basic .Net.
Useful to implement any protocol that uses BER (LDAP, SNMP, etc.).
GOSSiP is a P2P email reputation system. It uses social networking theory to track email sender spam behavior worldwide. Writtten in C and Perl, GOSSiP has compiled on Linux, Solaris, FreeBSD, and OS X. Works with multiple mailservers and spam filters.
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This project aims to be a personal data storage and administration system.
It will be an advanced system for information and electronic mail management. The server will be accessible to any IMAPv4 compatible mail client.
Raben is an email client based on xfmail and archimedes, but ported to gtk+-1.2 and soon to be ported to gtk+-2.
It will be a full featured email client allowing for multiple sources of email including spool,POP,& IMAP.
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ClamSMTP is an SMTP filter that allows you to check for viruses using the ClamAV anti-virus software. It accepts SMTP connections and forwards the SMTP commands and responses to another SMTP server. Works well with Postfix.
ASMMS -- Anonymous SMTP Mail Message Sender
... is an simple mta, written in C, for sending mails through mail
servers, which have no authentication (AUTH). It should work
on nearly all POSIX systems, tested only with SunOS, Linux and
HPUX.
IntimaLite is a standalone client that filters pop3 email accounts. therefore, it detects spam-emails by matching recipient emailaddress with a blacklist of blocked emailaddresses. [GERMAN/ENGLISH]
POPMail applies user-defined rules to messages
in a mailbox in order to allow you to delete some emails before
receiving them. For example, you can delete emails with a given
From: (sender) header, or larger than a max size.
DEPRECATED - This is now hosted at https://github.com/Yeraze/ytnef
ytnef is a program to work with procmail to decode TNEF streams (winmail.dat attachments) like those created with Outlook. Unlike other similar programs, it can also create vCalendar/vCard entries from meeting requests, address cards, and task entries.
Carassius is an Email client unlike any other. In addition to a new intuitive approach to the regular email protocols (POP3, IMAP, SMTP), Carassius also handles the major Webmail services including Gmail, Yahoo! Mail & Hotmail.
Limez is a high performance mailing list manager. It can be used to send (broadcast) e-mails to a huge number of users. Users can be stored in files, database or ldap directory. Limez have built-in SMTP-capabilities (no external MTA required).
Elmo is a feature-rich console mail client for UN*X power users. It integrates functionality commonly realised by separate pieces of software in other mailers.