What common mistakes are often made when sending emails using PHP, as seen in the provided script?

One common mistake when sending emails using PHP is not setting the headers correctly, such as the "From" address. This can result in emails being marked as spam or not being delivered at all. To solve this issue, ensure that the headers are properly set with the correct email address and additional necessary information. 

$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

mail function SMTP spam folder header injection error handling

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