Slow Attachment receiving in Exchange 2007 - FIXED
Since moving from Exchange 2003 on Server 2003 we have had random issues with Exchange 2007/Server 2008 and attachments. Text only emails are fast and responsive from all domains Small attachments, under 100K, seem to only take a few minutes. Large attachments, above 1.5MB, will often not be accepted and generate a 4.4.2 Connection Dropped message. We spent hours on the phone with MS support and they blamed our Network, NIC, Firewall, gremlins, etc... I did a lot of searching on the net and found that many people are experiencing this issue and that most have been unable to resolve it. I found a thread about setting the tarpitinterval 00:00:00 and tested it on the clients server - fixed the problem completely. With it set to a ANY value other than 00:00:00, the larger attachments just die - the exchange diagnostics show that the data is corrupted and requests that it be resent - on the senders side it appears that the the message never leaves the sending queue and eventually dies with a NDR. So, the fix was to enter this command and then restart the transport service: (command is broken across two lines since I use a real Usenet client with 72 character line limit) Set-ReceiveConnector "Internet Receive Connector" -tarpitinterval 00:00:00 Hope this helps others. You can't trust your best friends, your five senses, only the little voice inside you that most civilians don't even hear -- Listen to that. Trust yourself. spam999free@rrohio.com (remove 999 for proper email address)
February 17th, 2011 5:25pm

Thank you for your sharing. Here are more information about the topic. Parameters about “Set-ReceiveConnector”: http://technet.microsoft.com/en-au/library/bb125140.aspx Factors that cause backup and delay of internal emails: http://social.technet.microsoft.com/Forums/en/exchangesvrtransport/thread/7c70699a-3f84-4aab-9d0b-2d90a09d060a
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February 21st, 2011 4:40am

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