Hi, We have a form on our site for customers to ask questions. This form basically generates an email from the address donotreply@oursite.com and sends the contents of the form to our support email (which is checked by otrs). The subject of this email contains "Question by customer@acustomer.com" So I'd like to create a postmaster filter that sets the X-OTRS-CustomerNo to be customer@acustomer.com. I created a filter with: Match: Header 1: Question by (.*?) Set: Header 1 X-OTRS-CustomerNo: [***] This works as expected and sets the customer to be the email in the subject. However, my problem is that I'd like it to be a little more strict and only set it when the email is from donotreply@oursite.com, so I created the following: Match: Header 1: Subject: Question by (.*?) Match: Header 2: From: donotreply@oursite.com Set: Header 1: X-OTRS-CustomerNo: [***] This causes X-OTRS-CustomerNo to be set to the value '1'. Not sure why. Is there a way to get it to work? Also, a related question, what is the proper way to read a filter's rules? For example, is it: if match1 && match2 set1; set2 or is it: if match1 || match2 set1; set2 or is it: if match1 set1; if match2 set2; etc. Thanks for help! Chris