Add some basic tests for Email#delivery_status and remove Email#delivered
Cleanup left over columns in postfix_log_lines
Rename method
Rename delivery_status
Primarily test calculated_status rather than update_status!
More automatic updating of status
Extract partial
Don't use a list for the to addresses when there is only one
Move action for sending test email to new controller
Composing of test email is now in TestEmailsController
Redirect back to the form for creating mail