im running an ASA 5520 (ios 7.2(2)).
the mails for my organization were being collected in a pop account at the isp end.
the mail server is allowed to the outside network (internet)so it was easily sending mails outside.
to get mails we used to logonto a pop account and retrieve mails via pop retrieving software.
now we decided not to use the isp pop account and use our mail server to recieve mails directly. ( the mx entery on our hosted dns will be the live ip of our mail sever).
my Question is .. what port will i have to open on my ASA security rule to allow mails from outside network being sent to a server on my inside network,.
uptill now i only had http port opened for that server so it was acessable for home users.
will i need to open pop3 port or smtp ???