If you are using a Shared Mail server in a cPanel environment, you may want to try the following to prevent Spammer from sending to your mail server directly:

In cPanel Under mail management:  Select “Account Level Filtering”

Create this rule, and ALL email that does not go through SpamTitan will be discarded!

Note the following:

-  Make sure when adding the second rule, you use "and" and not "or"

- replace wileyvalentine.com w/your domain name