Pymta

- Dropped dependency to repoze.workflow because the module added a lot of
dependencies recently (six others in total). The new, custom state machine
also supports flags and conditions which suits SMTP very much.
- Added dependency to pycerberus (>= 0.3.1) to validate all sent parameters
thoroughly with sensible error messages.
- All inputs from peers is now validated
- relaxed restrictions for the HELO/EHLO parameter (as real world clients don't
send real host names)
- Fixed bug - ESMTP session switched back to plain SMTP after the first mail
was sent
- Fixed bug - Hang after sending data to a broken connection

- Compatibility fixes for Python 2.3-2.6
- Policies can drop connection to the client before or after the response
- CommandParser is more robust against various socket errors
- Better infrastructure and documentation to use pymta in third-party tests

- Fixed bug which caused hang after unexpected connection drop by client

- Switch to process-based architecture, got rid of asyncore
- Support for size-limitations of messages, huge messages will not be stored in
memory if they will be rejected anyway (denial of service prevention)
- API documentation is now auto-generated
- Renamed DefaultMTAPolicy to IMTAPolicy and moved all interfaces to pymta.api
- Added the debugging_server as an extremely simple example of a pymta-based
server

- wrote documentation
- bug fixes
- multiple messages in one SMTP transaction
- transparency support for lines in the message starting with a dot

- initial release