Block mail from certain domains
If you want to block mail from certain domains, eg *.ru or *.cn, then you can create 'rules' in VPOP3 to do this for you.
Where and how you create the rules depends on how VPOP3 receives mail and on exactly what you want to do.
If you use the VPOP3 Spamfilter and want the spamfilter to quarantine the message, you can add something like this to the spamrules_userchecks.txt file in the VPOP3 directory:
DefineRule "MyRule" 1 "My spam rules" BulkScan Score [MyRule] From /\.r...