What ports must be excluded from blocking in iptables in order to my Virtualmin setup to function properly? I know I should keep open 10000, 20000. What else?
I am asking this, because I configured simple forward setup for all the incoming mails in Filter and Forward Mail in Usermin, but unfortunately no mail is forwarded, so I thought maybe my mail is being blocked by apf, which is installed on my server.
On the other hand it works with no issue if I compose and send mail form the same box, so outbound port for sending e-mails should be working. Then why forwarding does nto work?