Thank you both. I think I may have two different problems. The first message is (if I can remember it exactly) "some of the recipients in the above message are not known. Do you wish to proceed anyway?" (close, probably not exact) then, upon sending, I receive a notice from the System Administrator, along with the message that was sent (presumably an email notice)that says "message was not delivered because the address does not exist." I think that the accounts I use are IMAP, and both sender and recieving server are supposed to be the same?
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