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Exchange 2007 Not Delivering Large Emails Between Sites

We have recently noticed that we are seeing delays between our European email server and Australian one both running E2K7 SP1. Research showed this was due to a number of large public folder messages up to 100Mb in size. Seemingly what happens is that these messages fail with a 421 4.4.2 Connection dropped error and only then do the other small messages get delivered.
Can anyone assist with how to fix this issue. Workaround is currenlt yo to suspend the large messages and restart the transport service.

Network is a MPLS WAN with up to 6Mbps of capacity available.

mass2612

Hi,

Its not suprising that you will see that delay since you are downloading 100MB updates over a WAN. I would consider settings the replication schedule so that you only download PF updates outside your business hours or set a limit of the size of the data.

How to Set the Replication Schedule for a Public Folder Database
http://technet.microsoft.com/en-us/library/bb629665.aspx

How to Set the Size Limit for Public Folder Replication Messages
http://technet.microsoft.com/en-us/library/bb629620.aspx

RMDOps

ASKER

Unfortunately this has been a long standing business process as Exchange 5.5 was the most efficient method we had of shipping this size file around. To now change that in a 5000 user environment is not a quick process.
Long term we will replace this solution but my problem still exists today so would like to understand if there are any alternatives. This was never a problem in E2K3

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mass2612

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RMDOps

ASKER

Unfortunately this is still occuring and appears on any messages over about 30Mb.

RMDOps

ASKER

replication of backlog eventually finished - normal operating processing