Well, I did figure the problem out. It's not an EdGE problem, since it happened on my android phone, also. I'm guessing that the 2 wifis (what's the plural of that?) that I tried it on block outgoing mail (perhaps by blocking port 25) that doesn't connect via their own system, presumably in order to prevent illicit mail relaying. Since the android phone works fine connecting via 3g/4g and not with wifi, it's definitely a wifi issue.
This is another reason I hate the world. On the other hand, in some places in Europe, they pronounce wifi "veefee," so that makes me feel a bit better.
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