Postfix Catchall – Avoid Spam

Pedro Lobito asked:

I’ve 2 accounts on my CentOS server configured with catchall email accounts. Lately I’ve been receiving bounced emails with virus that were supposedly sent from my server account, Ex: The postfix mail server is configured to allow only authenticated users to send mail but I’m wondering if the emails were sent from my server.
I’m wondering if they were sent from a different server but had a Reply To: my domain account.
How can I avoid this bounced emails?

My answer:

Don’t use catchall email accounts.

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