How does the MIME-Version header affect the display of HTML content in emails sent via PHP?

The MIME-Version header specifies the MIME (Multipurpose Internet Mail Extensions) version used in the email. Including this header is important when sending HTML content in emails via PHP to ensure proper rendering in email clients. To include this header, simply add it to the mail function headers parameter with a value of "1.0". 

$to = "recipient@example.com";
$subject = "HTML Email Test";
$message = "<html><body><h1>Hello, this is a test email!</h1></body></html>";
$headers = "MIME-Version: 1.0\r\n";
$headers .= "Content-type: text/html; charset=iso-8859-1\r\n";

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

Keywords

MIME-Version header HTML content emails PHP display

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