On Fri, 19 Jun 2020 11:41:46 +0200 Arne Steinkamm <freebsd-questions at Steinkamm.COM> wrote: > There is no single line containing a regexp matching anything like > ^User-Agent:.*Claws etc. That's because Claws, like many MUAs sets X-Mailer but not User-Agent. -- Steve O'Hara-Smith <steve at sohara.org>