Is my email header correct?

Question

Is the following "From" header incorect?

    // To send HTML mail, the Content-type header must be set
    $headers  = 'MIME-Version: 1.0' . "\r\n";
    $headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
    // Additional headers
    $headers .= 'From: Mail Master <mail@mailmaster.com>' . "\r\n";
if(sendEmailNow($email, $subject, $body, $headers)){

I get the error from my mail server. It says "Mail from error: Syntax error".

Thanks all for any help.

Update

I have stripped down the SendEmailNow function to the below and I get the same error:

//send an email
function sendEmailNow($email, $subject, $body, $headers){

    if (mail($email, $subject, $body, $headers)) {
      ##check email
      ##code to say email sent - compare with the number registered
      return true;
     }

     else {
      ##code to report an error 
      return false;
     }

 }

Update 2

Problem solved. I am running this on a windows machine using PHP 5. Like the correct answer chosen and the comments have said. Some mail servers have trouble understanding what I had previously. But what worked for me was this:

$headers .= 'From: mail@mailmaster.com' . "\r\n";

Answer 1

A Google search for the error message suggests that some SMTP servers fail to parse your syntax for the From header. Can you try the following syntax to rule out this possibility?

From: mail@mailmaster.com