Autoresponse is an autoresponder (used for generating automatic "out of office" or "vacation" replies) for Postfix that can be used with almost any Postfix setup. The autoresponse script is called by Postfix's pipe(8) in the same way that one would call a content filter.
an email autoresponder. Unlike the original vacation program, gnarwl is based on LDAP
ldapvacation is an LDAP-enabled version of the vacation program that sends an "I am not here" indication upon receipt of email.
an anonymous remailer. Remailers provide protection against traffic analysis and allow sending email mail anonymously or pseudonymously. Mixmaster consists of both client and server installations
rc_Responder is a free, open source autoresponder script released under the GNU/GPL. Powered by PHP and MySQL, rc_Responder allows website owners to easily maintain smart autoresponders that send multiple pre-written messages to subscribers at pre-determined intervals. Great for multi-day e-mail courses, pre and post sales follow-up messages, etc.
reply-o-matic is a highly configurable, secure, auto reply software, to be used in conjunction with any Mail Delivery/Transfer Agent or local delivery agent.
Vacation is a mail auto-responder (for when you are on vacation and such) written in Perl.
Vacation Mail Responder
the port of the 386bsd vacation program to Linux. Vacation is the automatic mail answering program found on many Unix systems
Yet Another Autoresponder
Yet Another Autoresponder (yaa) is an email (vacation) autoresponder that is able to fetch autoresponse data from various sources, using separate plugins for each source type. Currently developed plugins are SQL, LDAP, DB_File, BerkeleyDB, STATIC, and PCRE. It supports daemon mode operation (operates as an SMTP/LMTP server), so users can set up a single autoresponder server that is able to serve requests from many email servers. It doesn't reply to mailing list posts, and has built-in mechanisms to prevent autoresponder deadlocks.