Remove quotes from sample configuration file
Fix incorrect named parameter passing

Added kwargs to get_server_reference as configuration files
may contain more than these four variables; further, the
get_smtp_parameters doesn't restrict itself to the get_server_reference
parameters, which would lead to inexplicable behavior for
users.

Also, changed *list unpacking to the correct **kwarg unpacking.
Remove finally clause

I ran into an unexpected undefined variable error inside the
finally clause. It's not worth figuring it out; the SMTP
connections aren't guaranteed to be long-term so the
server on the other side of the connection likely won't
be bothered by a missing quit signal. Will figure this out
later.