How can additional headers be used in PHP to ensure proper email delivery from a form submission?

When sending emails from a form submission in PHP, it is important to include additional headers to ensure proper delivery. One common header to include is "From" to specify the sender's email address. This can help prevent the email from being marked as spam by the recipient's email provider. Additionally, setting the "Content-Type" header to "text/html" can ensure that the email is properly formatted as HTML. 

$to = "recipient@example.com";
$subject = "Subject of the email";
$message = "This is the message content";

$headers = "From: sender@example.com\r\n";
$headers .= "Content-Type: text/html; charset=ISO-8859-1\r\n";

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

Keywords

PHP email delivery form submission additional headers SMTP

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