TODO: NGMime
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NGMimeRFC822DateHeaderFieldGenerator:
- do not use -descriptionWithCalendarFormat:

- apparently a lot of code duplications for quoted printable decoding/encoding?
  look for "?iso-8859" in:
  - NGMimeAddressHeaderFieldGenerator.m
  - NGMimeContentDispositionHeaderFieldGenerator.m
  - NGMimeContentTypeHeaderFieldGenerator.m