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Postfix is an open source mail transfer agent (MTA), a computer program used on servers for the routing and delivery of e-mail. It is intended as a fast, easy-to-administer, and secure alternative to the widely-used Sendmail MTA. Postfix is the default MTA for a number of Unix(-like) operating systems. It is released under the IBM Public License 1.0 which is a free software licence. One of the strengths of Postfix is its resilience against buffer overflows. Another one is its handling of large amounts of e-mail and advanced content filtering against spams (see :