We had a report that someone was receiving lots of NDR messages from our mail server, on investigation through the message tracking center I found a huge list of NDRs that appear to have been generated and sent out. The original email was sent to an email address that didn't exist for any of our users but instead of the single NDR I would expect it seems that it is being sent again and again - I'm not to sure how to stop it sending any more right now... Here is a screenshot of the tracking center - http://www.seriousideas.com/mailissue.jpg Edit: have found the message in the Queues and removed it there, I'm keep to prevent this from happening again however so I'm wondering if this has been encountered before or if there are any settings I should check? matt

On Wed, 5 May 2010 10:07:53 +0000, seriousmatt wrote: > > >We had a report that someone was receiving lots of NDR messages from our mail server, on investigation through the message tracking center I found a huge list of NDRs that appear to have been generated and sent out. > >The original email was sent to an email address that didn't exist for any of our users Configure "Recipient Filtering" on your server so you don't accept messages sent to addresses that don't exist. >but instead of the single NDR I would expect it seems that it is being sent again and again - I'm not to sure how to stop it sending any more right now... >Here is a screenshot of the tracking center - http://www.seriousideas.com/mailissue.jpg The SMTP protocol logs are where you want to look to see what's going on. That may all be just one message that's never sucessfully sent and you're seeing the retries (every ten minutes). --- Rich Matheisen MCSE+I, Exchange MVP --- Rich Matheisen MCSE+I, Exchange MVP