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Postfix Documentation
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Additional notes

The MySQL configuration interface setup allows for multiple mysql databases: you can use one for a virtual table, one for an access table, and one for an aliases table if you want.

Since sites that have a need for multiple mail exchangers may enjoy the convenience of using a networked mailer database, but do not want to introduce a single point of failure to their system, we've included the ability to have Postfix reference multiple hosts for access to a single mysql map. This will work if sites set up mirrored mysql databases on two or more hosts. Whenever queries fail with an error at one host, the rest of the hosts will be tried in random order. If no mysql server hosts are reachable, then mail will be deferred until at least one of those hosts is reachable.

Postfix Documentation
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