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Is there a way to limit the list of mailadresses a user can send mail to, to a small whitelist of approved addresses?

The only option I can think of right now is a customized contact form, but I'm looking for a better way that is or can be integrated in an existing mailclient?

  • It is unclear about what kind of setup you are talking. A MTA (which), a firewall or mail gateway, a desktop system, a web mail client, ... ? I propose to close the question as too broad. – Steffen Ullrich Jun 11 '18 at 10:49

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Yes. Set up whatever mail server you use to filter mail based on destination. This is trivial.

For Postfix this is solved with the check recipient access table configuration directive, which lets you configure either a system wide, or per user allowed destinations. For different MTA's there's different options.

vidarlo
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