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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?

Andreas Andersen
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    I've had a server in Hetzner and hosted a mail server there with 30+ virtual domains for 10+ years. Since when they start blocking port 25? Or probably they only block it for VPSs? Or this is invalid https://community.hetzner.com/tutorials/postfix-as-SMTP-relay-server ? Probably, you can request unblock? Also, do they block incoming requests to your port 25, or outgoing requests to other's ports 25, or both? – Nikita Kipriyanov Dec 15 '22 at 13:02
  • Does this answer your question? [What ports to open for mail server?](https://serverfault.com/questions/149903/what-ports-to-open-for-mail-server) – vidarlo Dec 15 '22 at 13:58

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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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