Selective deleting of messages from POP3 account via Gmail (or anything else)?

Question

I'm importing emails into Gmail via POP3. Is there a way to delete from the server messages with a certain keyword in the subject and leave everything else on the server? If not Gmail than is there any other way of doing this? It is not possible to create filters on the original server or to add any scripts / cron jobs... Thanks!

Answer 1

Just found that I have IMAP access too, so I installed Thunderbird and was able to selectively and permanently delete the messages from the server. Not sure if it is possible with POP3...