bounce parser (when you sent out a campaign, and a subscriber's email bounces);
(un)subscribe by email feature, that allows people to send an email to subscribe to your mailing list(s)
In case you have all settings properly setup in the application, but your emails are still not being properly logged, please ensure of the following:
If using POP3 accounts, make sure that the application correctly connects to the POP3 server, authenticates, and can fetch emails from it.
If using PIPE, then send an email to that email address. If a PHP is not properly setup to parse it, you should usually receive a bounce email back from your server
Once you have ensured that all of the above works, and your emails are still not being logged by the application, there is a way of checking what happens with incoming emails that are not processed by the application. In order to turn on this feature (it is off by default), you will need to connect to your database and run the this query:
UPDATE `em_backend` SET `log_error_source` = 1;
That will set the system to start logging all incoming emails; therefore, the emails that already got in will not be accessible as the system was not set to log anything at that moment. In order to see which emails were dropped while the logging of errors is on, check the em_error_source table.
The log will contain the entire message source, therefore will consume a notable amount of space. If you wish to turn off the logging engine, run this query:
UPDATE `em_backend` SET `log_error_source` = 0;
To clear out the past log from your database, run this query:
