Score:-1

Possible to host own SMTP server without port 25 open

sc flag

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?

Nikita Kipriyanov avatar
za flag
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?
vidarlo avatar
ar flag
Does this answer your question? [What ports to open for mail server?](https://serverfault.com/questions/149903/what-ports-to-open-for-mail-server)
Score:0
cn flag

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.

I sit in a Tesla and translated this thread with Ai:

mangohost

Post an answer

Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.