How can the issue of "No recipient addresses found in header" be resolved when using the HTML Mime mail class in PHP?

Issue: The error "No recipient addresses found in header" occurs when using the HTML Mime mail class in PHP because the recipient address is not properly set in the email headers. To resolve this issue, make sure to set the recipient address in the headers using the "To" header field. PHP Code Snippet: 

<?php
require_once('Mail.php');
require_once('Mail/mime.php');

$from = "sender@example.com";
$to = "recipient@example.com";
$subject = "Test Email";
$body = "This is a test email.";

$headers = array(
    'From' => $from,
    'To' => $to,
    'Subject' => $subject
);

$mime = new Mail_mime();
$mime->setHTMLBody($body);

$body = $mime->get();
$headers = $mime->headers($headers);

$mail = Mail::factory('mail');
$mail->send($to, $headers, $body);
?>

Keywords

PHP HTML Mime mail class recipient addresses header error.

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