I don't. Plain text is typically formatted for 72-78 monospace characters - even if you don't want formatting, the text will look bad on any device that doesn't match IBM's 80-character punch cards from 1928.
In theory format=flowed solves that, but the same boomers that despise HTML mail also refuse to provide that accommodation, for anyone not behind a teletype.
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I don't. Plain text is typically formatted for 72-78 monospace characters - even if you don't want formatting, the text will look bad on any device that doesn't match IBM's 80-character punch cards from 1928.
In theory format=flowed solves that, but the same boomers that despise HTML mail also refuse to provide that accommodation, for anyone not behind a teletype.