Problem sending email via Blat to address that contains a period before the @

"[email protected] [blat]" <[email protected]>
Newsgroups gmane.mail.blat
Message-ID <[email protected]> 
I am using the most recent version of Blat. I am using it in a program. The email messages are sent without issue is all cases except when the address contains a period before the @. (Example: [email protected]).  Blat returns a code of 0, but no email is sent.  I can't figure this out. Has anyone seen this before?  You help is much appreciated.
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