What are the best practices for constructing email headers in PHP?

When constructing email headers in PHP, it is important to follow best practices to ensure proper delivery and formatting of the email. This includes setting headers such as From, To, Subject, and Content-Type correctly. Additionally, it is recommended to use the PHP `mail()` function to send the email with the specified headers. 

$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 .= "Content-Type: text/html; charset=ISO-8859-1\r\n";

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

Keywords

PHP email headers MIME Content-Type Content-Disposition

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