Description:
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In LINUX (throught proxy connection) I cannot able to send the mail function, mail function is working properly it will shows an message "msg sent successfully" but it is not reaching the destination email id.

In LINUX (throught direct internet connection) mail function is also working properly and also the mail is reaching the destination email id perfectly.

how can i rectify this problem


Reproduce code:
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---
From manual page: book.mail
---
<?php

$Name = "Da Duder"; //senders name
$email = "email@adress.com"; //senders e-mail adress
$recipient = "PersonWhoGetsIt@emailadress.com"; //recipient
$mail_body = "The text for the mail..."; //mail body
$subject = "Subject for reviever"; //subject
$header = "From: ". $Name . " <" . $email . ">\r\n"; //optional headerfields
if(mail($recipient, $subject, $mail_body, $header)) //mail command :)
echo "mail sent";
else
echo "mail failed to sent
?>

Expected result:
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this function executes in direct internet connection, but it has to work when i am using proxy connection too.

Actual result:
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it has to display the output

mail sent

and it has to reach to the destination(receiptent) email id