Sockets and Sendmail

[venquessa]

It looks like the socket "s" you get from writables is not in message_queues dictionary.
Are you sure it is?

For best practice protect all this dictionary[key] calls with:

if key in dictionary:
  # stuff
else:
  # log/print error

EDIT: I'm also not sure it's wise to use a socket as a dictionary key, though I'm sure it's possible.