Spam Posts Caught Quickly But Emails Sent - Ideas

It might be good to replace any url/uri in the body of responses sent out by email with a text 'unverified link' - go to forum to see the link.
instead of letting fast spammers get their url/uri into the inboxes of forum members

so if condition

http://
or [u r l=]

etc?

Just a few minutes ago one posted 8 or so posts :S Not cool