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When you say 'reputable' IP do you mean non-residential or is something like AWS, Linode, etc enough?

Edit: duplicate to sibling, apparently I had this tab open longer than I thought.

Yes, I meant non-residential, and also not AWS. The problem with AWS is that a lot of spammers use it, and so a lot of AWS IP addresses get tainted. If you go with a smaller ISP that charges more it's less likely that their clients will be spammers. But to be fair, I've never tried running a mail server on AWS. It's possible that you could do it and not have any problems, I don't actually know. It's probably an experiment worth doing.

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