Why are certain user emails having bounce back or an error stating ‘Email Address does not exist’?

This issue usually happens because you are sending an email to a non-existing email address or outdated email attribute which is pointed to the old email server.

To resolve this issue, clear the cached address by typing the email address but do not click enter. Click on the ‘X’ near the email address (As per the image below). Enter the email address again and try to send the email to the recipient again.