Ben aşağıdaki kodu vardır:

$message = "Good news! The item# $item_number on which you placed a bid of \$ $bid_price is now available for purchase at your bid price.\n
The seller, $bid_user is making this offer.\n
\nItem Title : $title\n

\nAll the best,\n
$bid_user\n
$email\n
";

echo $message;
$htmlContent = $baseClass->email_friend($item_number, $title, $bid_price, $bid_user, $mcat, $message, $email, $VIEWSTATE, $EVENTVALIDATION, $URL);

Sorun, new line break (\n) çalışma olmasıdır.