Sometimes, I cannot receive e-mail that has attached file that greater than 1 MB. However, sender needs to send 2 - 3 times in order to receive. Sender also does not get any error message or response that sending was failed. The e-mail was cc to many recipients, some of them can receive. Can anyone explain/solve this problem? Thank you,

Hi, Can you provide detail about your Exchange 2007 SP and RU level. What A/V do you use in your Exchage ENV, can you try to stop A/V on HUB & mailbox server for some time and try to reproduve the issue. Is this behaviour for some type of attached file or with all type of file..Anil

Follow this troubleshooting step Reproduce the issue with delivery receipt enabled Track the message Validate if recipients in question have had a delivery confirmation If no Make sure all the places have size restriction mentioned correctly like global settings, connectors etc also check if the emails aren’t landing to junk email etc If yes then check to see if any antivirus agents or rule aren't doing anything fishy If none of that help then you need to take help of transport pipeline tool http://technet.microsoft.com/en-us/library/bb125198(EXCHG.80).aspx Regards, Pushkal MishrA

Hi Is this issue for intenal>external? External>Internal? internal>internal? Depending on the above, message could be stopped at different hops. Also, use MT as suggested above. It may be the message is being delivered but may be an issue on the client side, ie. in Junk folder or permenently deleted. Give an exmaple and answer questions above. Sukh

Hi ChrisL, It looks like the problem of size restriction. validate if there are size restriction mentioned Global limitsConnector limitsServer limits User limits and so on and also check if there are antivirus agents or rule restrict the mail related reference:http://technet.microsoft.com/en-us/library/bb124345(EXCHG.80).aspx Best Regards, Jeff TechNet