We are running an exchange 2007 server with approx 180 users on it at the moment. Intermittently we experience a problem were any external emails that are sent to ourexchange systemwith an attachment above about 1Mb are not being received until the next day. If the attachment is roughly below this size the emails are received instantly. We know this could be some sort of bandwidth problem but we dont have the same issue with a Novell GroupWise server we have running on the same link. Could this be a problem with the exchange server rejecting the emails due to it being busy? Thanks for any help Regards Jason

If its busy it'll be all over the application log in event veiewer. Got anything?

We have a lot of warnings of: An error occurred on database "<My Storage Group>". Function name or description of problem: SLINK::EcUpdate Error: 0x8004010f And also have some warnings of: An error occurred on database "<My Storage Group>". Function name or description of problem: SLINK::EcUpdate Error: 0x8004010f Other then this i cant see anything to say it being in a busy state Thanks for the help Jason

Sounds like there is some corruption going on in your database. You might need to get eseutil going to repair it, but it'll have to be done offline. Any other evidence of database corruption? Have you got good backups (you might need them).

Yes we have good system state and storage group backups The problem has started once again today. I noticed today that store.exe was using about 5.5Gb of memory and all together is using about 8Gb. Is this normal? I can't see anything else pointing towards a db corruption. A repair ora restore is the last thing we want to do at the moment.

I have run an online SMTP test and got the following results RESULT: <Mail Server> Banner: <Mail Server>Microsoft ESMTP MAIL Service ready at Mon, 17 Mar 2008 11:50:32 +0000 [188 ms] Connect Time: 0.406 seconds - Good Transaction Time: 12.094 seconds - Not good! Relay Check: OK - This server is not an open relay. Rev DNS Check: Reverse DNS FAILED! This is a problem. GeoCode Info: Geocoding server is unavailable Session Transcript: HELO mxtoolbox.com - DIAGNOSTIC TEST - See http://www.mxtoolbox.com/Policy.aspx 501 5.5.4 Invalid domain name [5234 ms] HELO mxtoolbox.com 250<Mail Server> Hello [64.20.227.131] [328 ms] MAIL FROM: <test@mxtoolbox.com> 250 2.1.0 Sender OK [328 ms] RCPT TO: <test@mxtoolbox.com> 550 5.7.1 Unable to relay [5297 ms] QUIT 221 2.0.0 Service closing transmission channel [312 ms]