Im looking to “close down” my email server as much as possible, to not expose unnessesary ports. I know ports is mentioned here
But, all of those isnt really nessesary to be exposed? And all of those will most likely not be needed, or am I wrong?
Currently I have exposed those, and those are my comments and questions:
25 - Required?
4190 - Can I close this?
465 - Use 587 instead, and close this?
587 - Keep open
993 - IMAPs, is this better than POP3S below?
995 - Can be closed?
I know ports depends on what Im using and not, but hope to get some tips on what really is needed as minimum. This is a bit confusing for me at the moment.