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Is the "seen" list initially populated from our whitelist, or do we have to experience the delay once for every one of those, too?

Me too. It's rejecting my password now, but the IMAP server isn't. It was working at about 8:00 AM (pacific), the not at 10:30 AM.

OK, this is back intermittently. It only happens at work, so may be a firewall issue (though the error message leads me to believe the connection was established but failed to authenticate, it does take about as long as a failed TCP connection attempt so maybe that's what's really going on). I see one A record for smtp.cesmail.net from dig. Is that a round-robin? It would be helpful to have a list of all the IPs used for that name so we can enable them all in our outbound firewall rules.

It's working again. Looks like it was only out for a couple of hours, if that.

I've been using this for weeks now with Apple Mail. Suddenly today the smtp machine is rejecting my password. IMAP still works, as does the webmail interface. It was working this morning, and now it's not.