How can PHP developers ensure proper email header formatting to avoid issues with email interpretation?

Improper email header formatting can lead to issues with email interpretation by mail servers or email clients. To ensure proper formatting, PHP developers should use the PHP `mail()` function and properly format the headers by separating each header with a newline character (\r\n). 

$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 headers formatting interpretation errors

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