Connection rejected by policy [7.7] 4606

Hello,

One of our clients is getting the following bounceback errors:

SMTP error from remote mail server after initial connection:

501 Connection rejected by policy [7.7] 4606, please visit
www.messagelabs.com/support for more details about this error message.

We have tried the blacklist removal tool availible here:

http://ipremoval.sms.symantec.com/lookup/

But does not seem to have helped. The IP address is 64.191.166.23

Let me know if there is anything we can do from our end to help get this removed.

Thanks