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Even with TLS, that is usually handled by issuing STARTTLS on TCP port 25. I can't find anything in the RFCs mentioning server-to-server smtp delivery happening
by 0x0 5y ago
Even with TLS, that is usually handled by issuing STARTTLS on TCP port 25. I can't find anything in the RFCs mentioning server-to-server smtp delivery happening on anything but port 25? Do you have a reference for that? In fact, even the MX for google domains (aspmx.l.google.com) does not listen on TCP port 465 or 587, only 25.
- ssl232 5y agoI'm not certain, so you might be more informed than me. It's possible my server is sending on port 25 and since the firewall I use doesn't block outgoing connection I just didn't notice. TIL!