What are the essential components that should be included in a mail header when using PHP?

When sending emails using PHP, it is important to include essential components in the mail header such as the recipient's email address, the sender's email address, the subject of the email, and any additional headers like CC or BCC. This ensures that the email is properly formatted and delivered successfully. 

$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 .= "CC: cc@example.com\r\n";
$headers .= "BCC: bcc@example.com\r\n";

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

Keywords

PHP mail header essential components email headers

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