this post was submitted on 26 Apr 2025
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I'm very sure that, by default, at least postfix will send bounces only to local senders. So unless the spammers use your SMTP server to send spam, you shouldn't get any bounces. If they do, you have different problems.
Tell that to hotmail because they keep sending it. And be sure to update Google too because they don't know as much as you either. https://support.google.com/mail/thread/209018675/my-sent-email-box-is-filling-up-with-bounce-emails-and-emails-i-did-not-send-my-inbox-is-fine?hl=en