I have a rather vexing issue with incoming mail from 3 senders , when they send mail to any user on our exchange they get delivery receipts from our server but the users do not get the mails, also when looking in the Message tracking center I cannot find any record of the mails being received by Server or User. I have checked the Server’s AV product and even put the domains the senders use on a whitelist. We have 3 customers that send us mail that result in this issue all other mail internal and external routes perfectly fine. I have looked for rules or policies pertaining to mail routing to see if my predecessor had enabled anything out of the ordinary but again can find none. Any help on this rather confusing issue would be gratefully appreciated.

Can you check the delivery receipt of these users whether your SMTP server ( receiving end) is mentioned. Futher if they check in the sent items folder, right clicking the message and clicking message options would show the path the message travelled. This will give you an insight and confirmation whether the mail was EVER received by your server.

The problem is i have checked and the mail is actually getting to our server according to header information from the delivery reciepts and then vanishes without a trace but only from 3 sepcific external addresses.

On Thu, 18 Nov 2010 13:13:59 +0000, Aggellos wrote: > > >I have a rather vexing issue with incoming mail from 3 senders , when they send mail to any user on our exchange they get delivery receipts from our server but the users do not get the mails, also when looking in the Message tracking center I cannot find any record of the mails being received by Server or User. > > > >I have checked the Server?s AV product and even put the domains the senders use on a whitelist. We have 3 customers that send us mail that result in this issue all other mail internal and external routes perfectly fine. Does the AV Product record its actions? Do the messages show up in its logs? Are they passed to Exchange or quarantined/dropped by the AV software? >I have looked for rules or policies pertaining to mail routing to see if my predecessor had enabled anything out of the ordinary but again can find none. > > > >Any help on this rather confusing issue would be gratefully appreciated. If the messages don't appear in the message tracking logs that means they were stopped. That usually happens in the categorizer (it they even get that far). You see the messages in the SMTP protocol log, right? If you do, then those messages may be encountering problems in either your anti-spam or anti-virus software -- or they may be in the "Sender Filtering" or "Sender ID Filtering", or blocked by the IMF. You can increase the diagnostic logging level on the server's MSExchange Transport "NDR", "Categorizer" and "SMTP Protocol" categories to see if that provides any additional information. --- Rich Matheisen MCSE+I, Exchange MVP --- Rich Matheisen MCSE+I, Exchange MVP

Any update?James Luo TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx) If you have any feedback on our support, please contact tngfb@microsoft.com