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Postfix is Wietse Venema's mail server that started life at IBM research as an alternative to the widely-used Sendmail program.

Postfix is Wietse Venema's mail server that started life at IBM research as an alternative to the widely-used Sendmail program. Postfix attempts to be fast, easy to administer, and secure. The outside has a definite Sendmail-ish flavor, but the inside is completely different.

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