Messaging Gateway

We faced a very great problem with mailer-daemon messages. for every mail which was delivered to exchange a mailer-daemon was created on the delivery queue. And at the end of the date approximately 2 million of mailer-daemon was staid on the delivery queue. Regarding this issue we upgrade our SBG to 9.0 but no change regarding this problem. And also We change the bounce message timeout to 1 hour and after that the increasing of the delivery queue size getting decrease but We still have queue problem. Are there anyone how faced with that problem and solved it. Regards Cemile

Are you saying that for every inbound message you delivered forward to your internal Exchange servers, an NDR was returned from Exchange outbound through SBG?   You need to look at the NDRs and figure out why you are delivering mail to exchange that has no recipient.  With 2 million NDRs, do you have
-- Symantec Global Bad Senders   rejecting e-mail?
-- have you configured directory integration and recipient validataion to reject bad recipients

If you could describe more of your design / mail flow / policy that would help.

Check this document, it appears to address what you are experiencing:

Title: 'An NDR is received by a local sender after an Email has been successfully delivered by a Symantec Brightmail Gateway'
Document ID: 2009081115375854
> Web URL: http://service1.symantec.com/SUPPORT/ent-gate.nsf/docid/2009081115375854?Open&seg=ent