That's for plaintext mail, I assume. Somehow that rings a bell. Maybe some font-scaling at play. I recommend to install the add-on ThunderHTMLedit and check in the HTML tab which is displayed even for a plaintext e-mail.
That should show: `<body style="font-family: -moz-fixed; white-space: pre-wrap; width: 72ch;">` -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1850803 Title: Wrong wrap length when composing emails To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/1850803/+subscriptions -- ubuntu-bugs mailing list firstname.lastname@example.org https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs