My iPhone mail app can't send or receive mail (Gmail) while I'm logged onto my work WiFi network. I have no problems with other web access and can use my Gmail account via Safari without issue. From searching and reading, my understanding is that the Gmail Incoming Server Port is probably blocked. Is that correct? At the moment it is set to 993. Are there other ports I can try? Is there an outgoing server port also? I don't see it in the Mail prefs.