How can the use of additional headers in PHP email functions contribute to making email delivery more secure and less likely to be marked as spam?

When sending emails using PHP, adding additional headers can help improve email delivery by providing important information to email servers. This can include headers like "From", "Reply-To", and "MIME-Version". These headers can help identify the sender, set the reply address, and specify the email format, making the email more legitimate and less likely to be marked as spam. 

$to = "recipient@example.com";
$subject = "Test Email";
$message = "This is a test email.";
$headers = "From: sender@example.com\r\n";
$headers .= "Reply-To: sender@example.com\r\n";
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-type: text/html; charset=iso-8859-1\r\n";

mail($to, $subject, $message, $headers);

Keywords

PHP email functions additional headers secure delivery spam prevention

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