Freron MailMate

I have been using the MailMate trial (Version 1.14 (5852)) for the last two weeks and I generally like it. It is good to see there is finally someone taking care of making a good email client for the nerds and not just for the non-technical users whom Apple targets with Mail.app.

However, it doesn’t support hard wrapping of plain text emails, the main feature I consider important in a message composer. Various sources indicate that MailMate’s maintainer is opposed to hard wrapping philosophically, and refuses to implement it for that reason:
https://www.mail-archive.com/mailmate@lists.freron.com/msg14194.html

But here’s the reality:

• if someone sends me a mail that is hard wrapped to a certain number of columns, I assume that is because their mailer is from the dark ages and does not soft wrap displayed messages properly; so, as a matter of politeness, I try to reply hard wrapped to the same number of characters
• there are still many mailing lists where it is considered bad netiquette to post non-hard-wrapped messages, because participants with mailers from the dark ages find non-wrapped messages hard to read, and/or their Hypermail is set up not to apply white-space: pre-wrap to their HTML archives

Therefore, I would like MailMate to at least support as an option the style of plain text composition described here:
https://www.jwz.org/doc/html-compose.html
Tl;dr: I can control the soft-wrap column; the soft-wrap column only affects my lines, not quoted lines; when I send the email, the soft-wrap points get converted into hard line breaks.

(Also, the weird thing in MailMate where >s appear at the beginning of subsequent lines of soft-wrapped quotes may look pretty, but it’s really annoying to work with when excerpting only part of a paragraph to reply to. As jwz suggests, quoted lines shouldn’t soft wrap at all; or if they do, there should either be no ‘magic’ > that isn’t really there, or the ‘magic’ > should appear in a different font colour (light grey, maybe?))