Fix variable name
Really fix variable name

Improves: c116afb
Found by: Jille Timmermans
Call receive_error_event with node object

instead of node name
In elk geval een DARNode aanmaken voordat we hem proberen te strikken voor error-reporting
Bugfix (self -> darn)
Catch all errors during mail sending (most notably socket.error)
Merge branch 'master' into handle_connrefused
Escalate connect errors back to the DARNode and report them there.