One method might be to setup a postmaster filter with Header 1 set to From and the value equal to the email address and then configure the Set Header 1 to X-OTRS-Queue and the value equal to a trash queue. Then, create a generic agent to automatically delete items in the trash queue every 10mn Nathan Campbell Dallas Symphony Orchestra From: otrs-bounces@otrs.org [mailto:otrs-bounces@otrs.org] On Behalf Of Jean BROW Sent: Wednesday, August 18, 2010 3:13 PM To: otrs@otrs.org Subject: [otrs] Spam from an user We having an @hotmail.comhttp://hotmail.com user who sending spam to our OTRS system. How can we block his email address (we cannot block hotmail.ocm domain on the server). Thank you.