Admin Emails Addressed to undisclosed-recipients
Administrators may receive an email from the WHMCS system with two
To email headers, one of which is to
"To: undisclosed-recipients" "To: ".
Some email providers, notably Gmail™, may reject the email and bounce it back.
The email is addressed to the same admin email address in both the
BCC fields. This occurs because the admin email address appears in the BCC Messages list in the Mail tab at Configuration > System Settings > General Settings.