How to change the default placeholder email

Hi,

I would like to ask for help on how can the users change their default placeholder email who registered in my site with social login wherein during that time my user setting in “If the user’s social network profile has no email address, should we ask the user to enter it manually?” was “No, simplify the registration by automatically creating a placeholder email (Default)”. Because of that some of my users have email addresses with this pattern: [email protected] which are non-existing and are causing problems in my email receiving and sending.

Right now, I already change my user setting in “If the user’s social network profile has no email address, should we ask the user to enter it manually?” to “Yes, require the user to enter his email address manually and display this message:” in which all of my future potential users will be asked to put real email addresses instead of putting a default placeholder email when the user’s social network profile has no email address.

But still I want my existing users with the default placeholder email to be able to change it to their real email addresses in their end (frontend). May I know how please?

The page I need help with: [log in to see the link]