#5.5.0 smtp;555 RCPT TO syntax error (#5.5.2) (Full Version)

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Sallo -> #5.5.0 smtp;555 RCPT TO syntax error (#5.5.2) (30.Jul.2009 3:10:38 PM)

I have a user that gets the following rejection when he sends emails to a bunch of recipients:
There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.<mail.domain.msft #5.5.0 smtp;555 RCPT TO syntax error (#5.5.2)>

We have about 550 addresses that we are sending to and we put everyone in the BCC field. I tried breaking the list in half but still fails.

I have been all over google on this and have come up with nothing. Any advice on where to start would be great.


uemurad -> RE: #5.5.0 smtp;555 RCPT TO syntax error (#5.5.2) (3.Aug.2009 3:27:33 AM)

How are these outbound messages created?  In Outlook?  Using an application?  I question the method because Outlook/Exchange does not generate SMTP syntax errors for the RCPT TO command.  Look at your SMTP log for one of these messages - you may be able to spot what is going on.

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