On 13/03/2022 01:00, The Doctor via Exim-users wrote:
I was wonder if it is doable that the outside world can only see ports 587 and 465 while limiting port 25 to localhost only.
You can do tests on those combinations in the connect ACL, from which a deny will mean the connection is not accepted at the SMTP level. However, an SMTP 5xx is sent to say so - which says that the port it open; it might leak more information than you are wanting. I think you'd have to use firewall facilities - iptables or similar - to make it look like there was no MTA on the port. -- Cheers, Jeremy -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
