I'm trying to configure a Watchguard SMTP proxy so that messages get rejected on matching a string in the message body. Some of the spams we are getting only have a graphic map link to a company in China, so at least I can filter out emails based on who the soliciting company is.
How could I set this up in the Fireware Policy Manager to exclude mail that has the string "www.rxcremation.cn
" in the message body? Or is there something easier to do on the MS Exchange server to trash them?