Clarify comment string for EMAIL_SMTP_FROM_ADDR in config.
Fix ivar and incomplete items in email.server.MailContext docstring.
Add more logging to b.e.server.checkDKIM() function.
Fix Sphinx method link in b.e.server.generateResponse() docstring.
Update b.e.server.MailDelivery.validateFrom() docstring.
Update b.e.server.validateTo() docstring.
Update b.e.server.addServer() docstring.
Merge branch 'hotfix/0.2.1-docstrings' into develop