Problem in sc_mail_ok (SC V9.2.003)

when:
bla bla bla
$mail_to = ‘mail@xxx.com’ <-----
sc_mail_send (bla, bla, bla);
if ({sc_mail_ok}) {
echo “SEND OK”;
}
else {
echo “ERROR SEND”;
}
sc_mail_ok works fine, returns null or 1 [HR][/HR]when:
bla bla bla
$mail_to = {email}; or, $email or, [email] <-------
sc_mail_send (blah, blah, blah);
if ({sc_mail_ok}) {
echo “SEND OK”;
}
else {
echo “ERROR SEND”;
}
sc_mail_ok works BAD, returns ALWAYS 1 [HR][/HR]Any hint or suggestion?

THANK YOU.

[B]$mail_to = ‘{email}’;

{email} will be replaced by SC. It’s not a php variable.[/B]