Warning: mail() [function.mail]: SMTP server response: 503 RCPT first (#5.5.1)

PHP
1

Hi,

I have mail function but when I send it it appears to me as warning message like this

Warning: mail() [function.mail]: SMTP server response: 503 RCPT first (#5.5.1) in D:\Hosting\3181178\html\goldy\Bay\includes\functions.php on line 51

My php coding is like this


		$subject	=	"Notice about reservation cancel";
		$body 		= "<html>\
";
		$body 		.= "<body style=\\"font-family:Verdana, Verdana, Geneva, sans-serif; font-size:12px; color:#666666;\\">\
";
		$body 		.= "Notice about reservation cancel on Bay Airporter Express Inc";
		$body 		.= "Your reservation is cancelled
								Reservation Number : ".$res_num."";
		$body 		.= "</body>\
";
		$body 		.= "</html>\
";
		
		$headers  	= "From: Admin<admin@baei.com>\\r\
";
		$headers 	.= "Reply-To: webmaster@baei.com\\r\
";
		$headers 	.= "Return-Path: webmaster@baei.com\\r\
";
		$headers 	.= "MIME-Version: 1.0\\r\
";
		$headers 	.= "Content-type: text/html; charset=iso-8859-1\\r\
";
		
		mail($email, $subject, $body, $headers);

If any help would be great!

Cheers!!!