Factor out "email in public" parts

See this google groups thread.

The ability to send emails in public would be useful for several different projects.

The proposal is to design a REST-based API for sending, receiving and parsing emails. This would probably be based on a comprehensive python library.

It might include:

• an email message class to handle encodings and attachments, detecting quoted parts etc.
• email tagging
• handling of bounces,
• vacation messages
• REST api
• different algorithms to generate a unique id for sending emails
  • email prefix with salt and mail number in "from" address: <prefix><emailNum><hash>@domain
  • email mixed up from lots of random 3 - 4 letter words.

Existing email parsing utilities etc:

• https://github.com/mikel/mail/ (Ruby library)
• https://github.com/stefanw/froide/blob/master/froide/helper/email_utils.py
• http://www.ianlewis.org/en/parsing-email-attachments-python
• https://bitbucket.org/dariusdamalakas/parasykjiems/src/55603c50c53d/pjutils/get_mail.py
• https://github.com/sebbacon/PublicMail/
• https://github.com/sunlightlabs/sarahs_inbox/ (maybe)

Existing email parsing services:

• http://wiki.sendgrid.com/doku.php?id=parse_api