Hi,
try to change the order:
$headers = "From: Better Health Secrets <healthconcious@abcd.com>\r\n";
$headers .= "To: $listemail <$listemail>\r\n";
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: text/html; charset=iso-8859-1\r\n";
Or try
$headers = "From: Better Health Secrets <healthconcious@abcd.com>\r\n";
$headers .= "To: $listemail\r\n";
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: text/html; charset=iso-8859-1\r\n";
(Just the email address instead of email <email> in the To header)
How do the other headers look like ? What happens if you use \n instead of \r\n ?
Another problem might be that HTML might get blocked depending on the mail server configuration.
Thomas