=====
- Now **requires** Python 3.5 or above.
- Total refactoring. Now build on top of
`asyncio <https://docs.python.org/3/library/asyncio.html>`_
using
`async def <https://docs.python.org/3/reference/compound_stmts.html#async-def>`_
and `await <https://docs.python.org/3/reference/expressions.html#await>`_
statements.
- Removed config options from command line args. Now only available in config
file.
- Removed 'offline' and 'unavailable' modes.
- Refactored `init.d/debian-ubuntu/blackhole`, added `configtest` target.
- Removed reliance on all third party libraries.
- Removed deiman third party library and built it in.
- Debug flag no longer gives a warning.
- Delay flag is no longer a blocking method, now non-blocking and
asynchronous.
- STARTTLS has been disabled, it's not available with :any:`asyncio`. -
`https://bugs.python.org/review/23749/ <https://bugs.python.org/review/23749/>`_
- A lot of status codes have been removed.