Hi, I'd like to filter incoming mails with header filter. This is text: reason="fail (message has been altered)" I tried with: message\shas\sbeen\saltered (not working) What is the correct syntax? (i think the regex match) (Ispconfig 3.1.1)
A regex starts with a sign and ens with one, so e.g. with "/" (untested): /message\shas\sbeen\saltered/ Search Google for e.g. "postfix header checks filter example" to get some more examples.