+ Maybe add a suid-to-utterly-unpriviledged-user mode for the
  benefit of those not using system-wide fetchmails because they
  don't want root to have their mail passwords.
* verify .de template, and linelength of all templates
* verify all the weirdness with the signal handling, and
  especially concerning SA_RESTART [pending]
* fix heimdal support in unstable

2. when fetchmail exits with SMTP transaction errors (code 10), fetchmail jumps
out of the window before updating its .fetchids, thus, previous successful
transactions are done again the next fetchmail run -> duplicate mail on
receiver.