Scope:
Applies to all Barracuda Spam Firewall customers using an IMAIL IPswitch email server.
Answer:
There are built in SMTP access controls on the IMAIL server. Please check the rules listed for the following rule and verify there aren't any IPs listed with an "Allow all except clause":
- SMTP Access Control.
http://www.ipswitch.com/support/imail/guide/2006/imail_server_wh/Processing_Order.htm
Link to This Page:
https://campus.barracuda.com/solution/50160000000HAokAAG