I set up some custom fields at the beginning of the test, but for some reasons, some of the user passing the test don't get their info (required in the custom fields) registered in the database (i.e. "NULL"), so it's impossible to track the user if they are not already registered. Do you have an idea why this happens?
I have a second questions, regarding emails.
Automatic emails have "WordPress" as a sender, how can I modify this?
Thanks in advance for your help!