Mac:

  1. Thunderbird > Preferences > Advanced > General > Config Editor
  2. Search for mail.identity.default.suppress_signature_separator;
  3. Right click and toggle to true

Windows

  1. Tools > Options > Advanced > General > Config Editor
  2. Search for mail.identity.default.suppress_signature_separator;
  3. Double click on false to toggle to true
Written by Matt Cooper
Hi, I'm Matt Cooper. I started this blog to pretty much act as a brain dump area for things I learn from day to day. You can contact me at: matt@linuxtutorial.co.uk.