Connection rejected by policy [7.7]

Hello,

I'm one of those unlucky ones who has received this error and cannot understand the reason behind it.

                   The mail system<Name.Surname@city.ac.uk>: host cluster8.eu.messagelabs.com[
85.158.139.35] refused
    to talk to me: 501 Connection rejected by policy [7.7] 17909, please visitwww.messagelabs.com/support for more details about this error message.

Final-Recipient: xxx;Name.Surname@city.ac.uk
Original-Recipient: xxx;Name.Surname@city.ac.uk
Action: failed
Status: 4.0.0
Remote-MTA: dns; cluster8.eu.messagelabs.com
Diagnostic-Code: smtp; 501 Connection rejected by policy [7.7] 17909, please
    visit www.messagelabs.com/support for more details about this error
    message.

My personal mail server is clean according to http://mxtoolbox.com and I would like to ask you to remove it from your internal lists too, if that's possible. The IP is 212.109.219.205 (mail.kachkaev.ru; kachkaev.ru).

Given that the threads like mine start once in just a few days, it'd be great if you gave people a slightly more organised tool to than this forum. It could be a form explaining what exactly is happening and asking to submit  an IP address of a mailserver affected. The tool could be made available not just for those who have registered on symantec.com as account creation takes quite long.

Cheers,
Alex