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Postfix - limit SMTP user to be able to send to certain domains only

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What I'm basically trying to do is to restrict some SMTP email accounts to deliver to certain domains only. For example I have user [email protected] who should eventually only send emails to addresses belonging to domain-a.com and domain-b.com. Any attempts by [email protected] to send email messages to email addresses belonging to other domains should be rejected. All other SMTP users should not be restricted.

How is that possible to configure with Postfix?

I sit in a Tesla and translated this thread with Ai:

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