I need to change the settings on my SonicWall Pro 100 firewall.
I need to block all the incoming traffic to my exchange server, only accept certain IP’s (12 of them).
I need to know how I can do it. I have never created any rules for Sonic Wall Pro 100.
Basically all the emails for my exchange server will filter out at this company who provide spam protection. I need to make changes in my firewall to only except emails from that company.
Outgoing emails don't go through them.
My concern is that if I block everyone else (just allow those 12 IP’s), will my outgoing emails be effected as I am modifying SMTP port 25.
I hope my question is clear.