I thought Port 110 was used for POP mail access by a server and not a client
POP3 would not be used by a server, it would be used by a client to download messages from a server. Email servers would listen for incoming connections from clients on port 110, but would move messages (between email servers) using SMTP. On a SOHO firewall you would expect port 110 to be open outbound, but only allowed inbound as part of a connection established from inside (stateful packet inspection). Assuming that POP3S isn't negotiated.
Now, what I'm finding is if I set it up with WPA, it closes port 110, so my pop3 stops working & if I switch it off, or turn it to WEP, which I'd obviously rather not do, then everything works ok.
Sprogget, that is very odd, given that wireless with WPA operates at layer 1 & 2, while POP3 is an application layer protocol, which "should" be utterly independent of the security implemented at the physical / data-link / MAC layers and separated from them by the Network (IP) and Transport (UDP / TCP) layers.
SD