We recently discovered that several emails, we were expecting, were being rejected by our Exchange Server 2007 and giving the following response:
SMTP command failed when talking to server.domain.com: <<< MAIL FROM:host@remotedomain.com SIZE=16164910
>>> 552 5.3.4 Message size exceeds fixed maximum message size
The resolution was to go into:
- Exchange Server Management Console
- Organization Configuration
- Hub Transport
- Locate the appropriate Receive Connector
- Adjust the value of the Maximum Message Size (KB)


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