Mail Server
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This is the home page of the procmail mail processing and SmartList mailing list suites. Procmail can be used to create mail-servers, mailing lists, sort your incoming mail into separate folders/files (real convenient when subscribing to one or more mailing lists or for prioritising your mail), preprocess your mail, start any programs upon mail arrival (e.g. to generate different chimes on your workstation for different types of mail) or selectively forward certain incoming mail automatically to someone. The current stable version of procmail is 3.15.2. The current (unstable) development version of procmail is 3.21. The current version of SmartList is 3.15.
Postfix attempts to be fast, easy to administer, and secure. The outside has a definite Sendmail-ish flavor, but the inside is completely different. This website has information about the Postfix source code distribution.
Sendmail, Inc. provides message processing appliances, applications, and services that enable enterprises to modernize their messaging infrastructures. All Sentrion Message Processors run on the Sentrion Message Processing Engine , which includes an enhanced version of the Sendmail Open Source MTA and runs dozens of applications found in the Sentrion Application Store . Sendmail also provides services and support for sendmail Open Source MTA users. Sendmail, Inc. continues to support Open Source solutions and to advance the Open Source sendmail MTA.