Hi, We have an issue on our postfix installation (3.4.23-0+deb10u1) : a mail that should pass header_check is discarded.
The message in log is : < discard: header X-Mailer: ((OTRS)) Community Edition Mail Service (6.0.37) [...] >. The x-mailer filter is this one : /^X-Mailer: .*(PSS Bulk Mailer|ccMail Link|IXO-Mail|MMailer|K-ML|GoldMine|MAGIC|bomber|expeditor|Brooklyn North|Broadcast|DMailer|Extractor|EMailing List Pro|News Breaker|dbMail|Unity|PG-MAILINGLIST PRO|Dynamic| Splio|Sarbacane|sMailing|Broadc@st|WorkZ|ABMailer|QuickSender).*$/ DISCARD As you can see, the filter should not be applyed to the header, nothing match. We previously received correctly messages from this sender but the x-mailer was : < X-Mailer: OTRS Mail Service (6.0.28) >. Can the text with < ((XXX)) > can be problematic ? Thanks
