1-2-All can save the info about every responder sent in a log table. In order to turn this feature on, please define a variable in your engine.inc.php file:
$GLOBALS['log_responder'] = 1;
Then you can find the logs on what happened with what email address in database table 12all_logs.
Autoresponders are those with message field set to 0 and responder field to responder ID.
