Trailing spaces, treated as soft breaks, according to "flowed" text standard.
In theory, the app should check if the MIME header has a "format=flowed", in practice, it's quite difficult, so the logic is used anyway.
Two ways to fix:
- App settings -> mail, other -> turn off "flowed text"
AND/OR
- Fix it in logwatch, no reason why those trailing spaces should be there at all