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SpamAssassin by Alistair McDonald

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MTA Configuration

All of the MTAs featured here are highly configurable. If possible, test changes on a test server and not on a live MTA, and always make a backup of your configuration before making changes. It is possible that you may end up altering the configuration of the MTA in such a way that it does not operate correctly.

Sendmail

Sendmail is the grandfather of all MTAs. Its long heritage implies that it inherits some of the friendliness of the pre-commercial Internet. This means that older installations might relay email. Additionally, installations that were first configured with an old version but have been upgraded may also retain some configuration settings that allow them to relay email.

Sendmail is packaged by most Linux distributions, ...

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