Some SMTP connections to Symantec Messaging Gateway (SMG) are being rejected. This occurs even though the connecting IP address is in the Local Good Sender IP list (found in Reputation > Good Senders > Local Good Sender IPs).
The Message Audit Log indicates that the message has been rejected by the msg_reject_other event.
vm-sbg> malquery -p 10m -e "IRCPTACTION*msg_reject"
<event time="1374877913" name="ACCEPT">126.96.36.199:60434</event>
<event time="1374877913" name="IRCPTACTION"><none>|msg_reject_other</event>
450 4.3.2 try again later
Whitelisting an IP address exempts it from anti-spam scanning. However, the IP address is still subject to Directory Harvest Attack (DHA) and Email Virus Attack (EVA) policies, if those policies are enabled.