Mailing errors on Bulk emails :
The purpose of this is a diagnostic on email delivery, to discover where an error lies, if the email is not received.
E.g. the email address is incorrect with a colon and not a ‘dot’: ‘….@gmail;com’ as opposed to ‘…@gmail.com’ OR there is the number 2 instead of the @..: ‘….2gmail.com’ as opposed to ‘…@gmail.com’
This makes it clear that, if the email was not received and the System has successfully sent it, then the you will need to look elsewhere for the reason why.