I have a VPS on Digitalocean and Hetzner, but both block port 25, so I cannot host my own SMTP server here. However port 587 is open, so my question is: Is it possible to host your own standalone SMTP server, when port 25 is blocked, so it uses port 587 instead?
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It will work as long as you don't want to transact with other servers using RFC standards for purposes of sending or receiving email.
Paul
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