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At what level do ISPs control ports?
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We do that upstream, no way for you to avoid it. For good reason too, our team handling abuse notifications mails was super swamped with people whose ancient XP PCs had malware sending spam.
Forget running your mail server on a residential IP anyway. You'll be instant blocked by any mail provider, residential IPs are always spam, because of the aforementioned XP PCs.
Personally I wouldn't self host mail anymore anyway. Too much trouble.