>Progress: We've verified that the SMTP server it correct (even tried using 
>the IP Address instead).  I've had him *Reply* to a message from me, so 
>it's not a typo/etc.  Verified that POP3 works fine.

ok, but when he replies to you, he doesn't use POP3, but SMTP.  He uses 
POP3 only for working with his mailbox.

So the pb, from how I understand the err msg, is that when his mail client 
sends mail, via SMTP, to Imail, Imail refuses it.  What's in your logs for 
this client? Have you turned on smtp debugging to get a closer look at his 
failed SMTP delivery to you?

Len

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