MAIL -> booleandelbcc ( [ string address ] )
Return TRUE if has been successfully deleted, FALSE if not.
string address format is "localpart@domainpart.tld".
Example:
$m = new MAIL;
// add Bcc mail address
$m->AddBcc('localpart@domainpart.tld');
// delete Bcc mail address
$m->DelBcc('localpart@domainpart.tld');
// delete all Bcc mail addresses
$m->DelBcc();