<blockquote>In this post, I propose bending the format=flowed RFC by allowing lines up to the SMTP limit of 998 characters, in order to improve the plaintext reading experience for users of non-compliant email clients and services, such as GMail, FastMail, Outlook and others.</blockquote>

bookmarked in Bascht's Pinboard: https://vxlabs.com/2019/08/25/format-flowed-with-long-lines/