use canonical_name if it is available; report error when recipients don't exist #28
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the main aim of this PR was to make use of my canonical_name mod if possible. canonical_name corrects mis-capitalized user names. if canonical_name is installed, sending mail to "FlUX" will correctly be delivered to "flux", instead of ending up in limbo.
i also added a basic feature where a sender is alerted w/ a chat message if one or more of the recipients does not exist.