[otrs] PostMaster Filter

Hello, I'm trying to setup a PostMaster Filter but somehow the filter is not working. This is what I'm trying to achieve: - Change the Article Type from "email-external" which is the default to "email-internal" depending on who is sending/receiving the email. This is the way I setup the filter: ---------------------------------------------------------------- Stop after match: No MATCH Header 1 --> To Value --> EMAILADDRESS:email@company.com SET Header 1 --> X-OTRS-Article Type Value --> email-internal ---------------------------------------------------------------- The email is always logged as "external-email" regardless of the filter I setup. Do you have any idea and why would a filter not work? Or should I do anything in the configuration enable filters? Thanks, Gustavo