What parameters should be included when using the PHP mail function to ensure successful email delivery?

When using the PHP mail function to send emails, it is important to include certain parameters to ensure successful delivery. Some key parameters to include are the recipient's email address, the subject of the email, the message content, and additional headers such as From, Reply-To, and MIME type. 

$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 mail function parameters email delivery SMTP server headers

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