I have the following code:
$message = \"Good news! The item# $item_number on which you placed a bid of \\$ $bid_price is now available for purchase at your b
Try \r\n in place of \n
\r\n
\n
The difference between \n and \r\n
It should be noted that this is applicable to line returns in emails. For other scenarios, please refer to rokjarc's answer.