By default, 1-2-All logs failed subscribers only. In case you wish to log every subscriber to whom an email is sent to, please turn on the Log Mailing (database logging) or Log Files (file system logging) feature.
If you wish to change the logging level,, please define a variable in your engine.inc.php file:
$GLOBALS['mailer_log_level'] = 4;
Available logging levels are:
0 = Off 1 = Errors only 2 = Failed deliveries 3 = Network commands 4 = Everything
Each succesive error level includes everything below it, so if you set an error level of "3" you’ll also get log entries as levels 1 and 2 being logged.
The default setting is 2, and it is not recommended to keep this value less than the default setting.
