IPS blocking email

Legitimate email is being blocked by the IPS:

Message........: SMTP Content-Transfer-Encoding overflow attempt
Details........: Snort ::
Time...........: 2012:11:23-11:41:00
Packet dropped.: yes
Priority.......: high
Classification.: Attempted Administrator Privilege Gain
IP protocol....: 6 (TCP)

Source IP address: 192.168.1.2 (astaro1)

The email is stuck in the SMTP Spool, and keeps trying to resend it.

Any suggestions on how to fix this?

Should I just put an exception in for this rule?

Doesn't sound like a safe solution, long-term.

Running 8.307 (waiting for HA version of release 9!)

Thanks,

James.

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