Xen users - Aug 2010 - DSN: failed (Returned mail: Data format error)

This is a Delivery Status Notification (DSN).

I was unable to deliver your message to
oriz@www.ma.

I said 
  MAIL FROM:<xen-users@lists.xensource.com>

And they gave me the error;
  550 5.7.1 Mail from 65.49.16.198 refused by because IP is on BarracudaCentral 
- see http://www.barracudacentral.org/lookups

 



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