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Microsoft Exchange compatible server and client libraries
OpenChange is a portable Open Source implementation of Microsoft Exchange server and Exchange protocols. It provides a complete solution to interoperate with Microsoft Outlook clients or Microsoft Exchange servers.
OpenChange client-side library is used in existing messaging clients and is the solution in new projects to communicate natively with Microsoft Exchange and Exchange-compatible servers. OpenChange server is a transparent Microsoft Exchange server replacement using native...
Heirloom mailx (formerly known as "nail") is intended provide the functionality of the POSIX mailx command with additional support for MIME messages, IMAP (including caching), POP3, SMTP, S/MIME, message threading/sorting, scoring, and filtering.
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.
Mboxgrep is a small, non-interactive utility that scans mail
folders for messages matching regular expressions. It does matching against basic and extended POSIX regular expressions, and reads and writes a variety of mailbox formats.
Paligo is an end-to-end Component Content Management System (CCMS) solution for technical documentation, policies and procedures, knowledge management, and more.
SylixOS real-time operating system, system layer consistent with the POSIX standard (except some kernel service). some open source software has been integrated into SylixOS. it is a complete embedded software development platform.