When writing emails, aerc's default behavior seems to be to wrap lines at 72 characters.
Outside of programming mailing lists, not wrapping lines or at least having a much larger line wrapping threshold is the standard. It would be nice to have an option to set or disable aerc's line wrapping in aerc.conf.
This configuration must be done in your text editor, not in aerc.
For example, you could configure vim’s settings for filetype=mail.
Thank you,
autocmd filetype mail set textwidth=0got the job done.