Exchange 2003 - 2007 interoperatibility issue - Message Size

Posted on 2011-03-09
Last Modified: 2012-05-11
We have a mixed environment of exchange 2003 / 2007. We are having a strange issue. when i try sending email with message size >10MB from exchange 2003 to exchange 2007, it fails and i get NDR with 5.2.3 status. however, when i send the same email the other way, it gets delivered. It only happens with messages >10MB. i have changed the setting of exchange 2007 at organization level, receive connector level and user mailbox level to receive emails upto 30 MB in size. Also, i have changed the settings on exchange 2003  at administrative group > Protocols >SMTP virtual server level to allow 30 MB of email to go through. however, sending emails of size > 10 MB from exchange 2003 to 2007 still fails. i have rebooted the information store and still its the same. i enabled diagnostic logging on exchange 2003 and still could not find anything concrete. I have observed that email never reaches exchange 2007 server. Another observation, mails >10 MB flows without issues within exchange 2003 mailboxes and so is for exchange 2007. Please let me know what am i missing.
Question by:REISys
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Expert Comment

ID: 35092249
Have you looked at (in exchange 2007):
organization configuration - Hub Transport - Global Settings - Transport Settings?

Author Comment

ID: 35095921
Yes. I have sent the Max Receiving size of the message on Transport Settings to 30 MB. Still its failing.

Author Comment

ID: 35095927
Sorry, i meant SET and not Sent

Yes. I have SET the Max Receiving size of the message on Transport Settings to 30 MB. Still its failing.
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Expert Comment

ID: 35106094
OK. it seems that you have checked most, but just to be sure I will mention that there are several places to set limits on exchange 2007.
See this article for more info:
The same is for 2003
see this article for more info:

Accepted Solution

REISys earned 0 total points
ID: 35110180
Thanks for your help. Problem has been resolved. I forgot to start the transport service after making these changes.  -:)
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Expert Comment

by:Alan Hardisty
ID: 36547897
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.

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