We've disabled the default email address option as it's a spam magnet. It's removed the normal option to set the default address and the main email account is not visable however at the bottom of the email page there is still a link to it which gives them access again:
"Your default account has been set to either reject incoming email or forward it to another account. Check Default Address for the destination of default mail for this domain."
Can this please be sorted cPanel.
WHM 11.15.0 cPanel 11.17.0-C19353