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Postfix Documentation
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Postfix PostgreSQL Howto


Introduction

The Postfix pgsql map type allows you to hook up Postfix to a PostgreSQL database. This implementation allows for multiple pgsql databases: you can use one for a virtual(5) table, one for an access(5) table, and one for an aliases(5) table if you want. You can specify multiple servers for the same database, so that Postfix can switch to a good database server if one goes bad.

Busy mail servers using pgsql maps will generate lots of concurrent pgsql clients, so the pgsql server(s) should be run with this fact in mind. You can reduce the number of concurrent pgsql clients by using the Postfix proxymap(8) service.

Postfix Documentation
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