In what ways can the headers in email messages be properly formatted and structured to comply with RFC standards when using the mail() function in PHP?

When using the mail() function in PHP to send email messages, it is important to properly format and structure the headers to comply with RFC standards. This includes including headers like From, To, Subject, and Date in the correct format. To ensure compliance, headers should be separated by "\r\n" and the entire header string should end with "\r\n\r\n" before the message body. 

$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/plain; charset=ISO-8859-1\r\n";

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

Keywords

PHP mail() function headers email messages RFC standards

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