I do nearly all my mails with neomutt. So, I naturally edit mails with vim (neovim to be precise). These settings add a couple of autocompletes for very common mail-phrases. Furthermore I restrict the line-length of my mails to 78 chars per line, since this is the recommended line-length according to RFC-5322. Reference: https://datatracker.ietf.org/doc/html/rfc5322#section-2.1.1