[Bug 1850803]

Wed Nov 6 18:45:15 UTC 2019

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;">`

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https://bugs.launchpad.net/bugs/1850803

Title:
  Wrong wrap length when composing emails

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