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Postfix Documentation
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Measures against clients that make too many connections

Note: this feature is not included with Postfix version 2.1.

The Postfix smtpd(8) server can limit the number of simultaneous connections from the same SMTP client, as well as the number of connections that a client is allowed to make per unit time. These statistics are maintained by the anvil(8) server (translation: if anvil(8) breaks, then connection limits stop working).

IMPORTANT: These limits are designed to protect the smtpd(8) server against flagrant abuse. Do not use these limits to regulate legitimate traffic: mail will suffer grotesque delays if you do so.

Postfix Documentation
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