For incoming e-mail I already get a diary entry suggestions created by my “procmail log-file to diary” converter, but outgoing e-mail messages are also worth an entry in my diary. Yes, of course, I can always Cc or Bcc myself, but I would still have to … – alright, … – extended my .procmailrc, letting it log the “To:” header field (being extracted using formail), extended my converter, and … – looks like a good idea today.
Yes, I really love to document in my diary, whatever possible. And automatic suggestions (e.g. from e-mail traffic, from phone calls, …) are really nice.