NEXT_RELEASE:
 - SMTP server:
   - Now gives application-level code opportunity to set a different
     Received header for each recipient of a multi-recipient message.
 - IMAP client:
   - New `startTLS' method to allow explicit negotiation of transport
     security.

0.1.0:
 - Tons of bugfixes in IMAP4, POP3, and SMTP protocols
 - Maildir append support
 - Brand new, improved POP3 client (twisted.mail.pop3.AdvancedPOP3Client)
 - Deprecated the old POP3 client (twisted.mail.pop3.POP3Client)
 - SMTP client:
   - Support SMTP AUTH
   - Allow user to supply SSL context
   - Improved error handling, via new exception classes and an overridable
     hook to customize handling.
   - Order to try the authenication schemes is user-definable.
   - Timeout support.
 - SMTP server:
   - Properly understand <> sender.
   - Parameterize remote port
 - IMAP4:
   - LOGIN authentication compatibility improved
   - Improved unicode mailbox support
   - Fix parsing/handling of "FETCH BODY[HEADER]"
   - Many many quoting fixes
   - Timeout support on client
