SMTP server response was -> 553 (automated messaging failures)

"[email protected] [blat]" <[email protected]>
Newsgroups gmane.mail.blat
Message-ID <[email protected]>
Our restaurant has an automated messaging reservation system (Respak) that constantly receives BLAT errors as the reason for failed delivery of emails. It is a chronic issue that seriously affects the running of our small business.
 

 The error is below, please help with a solution.
 

 Blat v2.6.2 w/GSS encryption (build : Feb 25 2007 12:06:19)
 

 Sending C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\RP1301.tmp to [email protected]
 Subject: Marque Restaurant booking
 Login name is Marque Restaurant <[email protected]>
 The SMTP server does not like the name [email protected].
 Have you set the 'To:' field correctly, or do you need authorisation (-u/-pw) ?
 The SMTP server response was -> 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)
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