Should the ports that avast uses in its mail shield match the ports in my mail client? In my mail client, which is Thunderbird, the incoming port is 143, and the outgoing is 587. Avast is using 993 and 465. I did not set the ports myself, but I had always thought that they needed to match for it to work correctly. I'm a noob when it comes to networking so I'd love it if someone could verify if these settings are ok. And I did disable SSL/TLS in Thunderbird as well.