A lot of changes

- don't send emails multiple times
- fix the forwarding procedure
- send secure tokens automatically instead of on-request
- ignore duplicate emails (matches by message-id)
- allow passing an SMTP `to` to `sendmail()`, instead of always using
  the headers
- don't add self to cc when not needed, etc etc
- introduce a postprocessor function mechanism that runs a function
  right after our sendmail() processes your email, and right before
  adding it to the smtp queue

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