Mail Server
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Sendmail
Sendmail – Open Source Mail Server
Sendmail is a general purpose internetwork email routing facility that supports many kinds of mail-transfer and -delivery methods, including the Simple Mail Transfer Protocol (SMTP) used for email transport over the Internet.
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Postfix
Postfix – Open Source Mail Transfer Agent
Postfix is a free and open-source mail transfer agent (MTA) that routes and delivers electronic mail, intended as an. Postfix has standards-complaint support for SMTP, LMTP, STARTTLS encryption, SASL authentication, MIME encapsulation and transformation, DSN delivery status notifications, IPv4 and IPv6.
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QMAIL
QMAIL - An OpenSource Mail Transfer Agent
qmail is a mail transfer agent (MTA) that runs on Unix. It was written, starting December 1995, as a more secure replacement for the popular Sendmail program. qmail is a modern SMTP server which makes sendmail obsolete. qmail's source code is in the public domain. It is also free software.
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EXIM
Exim - Open Source message transfer agent
Exim is a message transfer agent (MTA) developed for use on Unix systems connected to the Internet. It is freely available under the terms of the GNU General Public Licence. In style it is similar to Smail 3, but its facilities are more general. There is a great deal of flexibility in the way mail can be routed, and there are extensive facilities for checking incoming mail. Exim can be installed in place of Sendmail, although the configuration of Exim is quite different.
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Open-Xchange
OpenXchange – A Unix based Proxy Server
Open-Xchange Server is a partially open source project sponsored by Open-Xchange, Inc., developing collaboration software; i.e. email, calendaring, etc. Product offerings based on Open-Xchange Server are marketed under the brand of Open-Xchange Server and various other names, e.g. 1&1 MailXchange, Network Solutions Business Email and others. Open-Xchange Server is part of the Lisog open source stack initiative.
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