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Unable to send email using mail() function

I am using php 5 with apache 2.2 under win xp pro.

I am using the following PHP script to send email,
but I get the error(shown in the error.log of apache)
[Sat Jun 14 13:41:37 2008] [error] [client] PHP Warning:  mail() [<a href='function.mail'>function.mail</a>]: SMTP server response: 550 5.7.1 Unable to relay for receiver@gmail.com in C:\\Program Files\\Apache Software Foundation\\Apache2.2\\htdocs\\test2.php on line 8

(Note that in my case I have replaced receiver@gmail.com as the my own email).

May I know how to resolve this problem?

$to = "receiver@gmail.com";
$subject = "Test mail";
$message = "Hello! This is a simple email message.";
$from = "sender@company.com";
$headers = "From: $from";
echo "Mail Sent.";

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3 Solutions
william007Author Commented:
Some more info, I am sending email via my local machine.
Following is the relevant contents in php.ini.

[mail function]
; For Win32 only.
SMTP = localhost
smtp_port = 25

; For Win32 only.
;sendmail_from = me@example.com
uncomment ;sendmail_from = me@example.com and put your valid email address here
william007Author Commented:
What kind of valid email?

In the localhost, I don't have any SMTP setup there, thus do not have any email address as well.
(I am not sure with this I am able to send email)

Or you mean the email address of another SMTP server like abc@gmail.com...which is the gmail SMTP server?
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"If you have a test server in use running Windows and some kind of WAMP combo (XXAMP, WAMP Server, etc) then you'll notice that the PHP sendmail command (mail()) does not work. Windows simply does not provide the sendmail statement ..."

This is an excerpt from a User Contributed Note on php.net concerning the mail() function.
For a suggested work-around, check the full note:
In my setup. I have setup an smtp server software at localhost port:25.

In Xp professional you can try the following to setup smtp service

Go to control panel -> Add/remove programs -> select Add/remove windows components -> Select IIS and click details -> In details check SMTP Service and click on ok

You may need to go to -> Control Panel - > Administrative Tools -> Services  to start the SMTP Service
Matthew KellyCommented:
If you do not have a email server running on the machine running PHP, mail will not work.

The best approach is to use a 3rd party mail program. In the past I have used PHPMailer


Below is the PHP code to use it. Place class.phpmailer.php into your php includes directory.

Replace text in << >> with your server information: http://www.emailaddressmanager.com/tips/mail-settings.html
$mail = new PHPMailer();
$mail->IsSMTP(); // send via SMTP
$mail->Host     = "<<smtpserver>>:<<stmpport>>"; // SMTP servers
$mail->SMTPAuth = true; // turn on SMTP authentication
$mail->Username = "<<uname>>"; // SMTP username
$mail->Password = "<<pword>>"; // SMTP password
$mail->From = "<<email address from>>";
$mail->FromName = "<<email name from>>";
$mail->AddAddress("<<email address to>>"); 
$mail->AddReplyTo("<<email address from>>","<<email name from>>");
$mail->WordWrap = 50; // set word wrap
$mail->IsHTML(true); // send as HTML
$mail->Subject  =  "Subject";
$mail->Body     =  "Body text";
$mail->AltBody  =  $mail->Body;

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william007Author Commented:
Thanks :)
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