What are common errors encountered when using the mail() function in PHP?

One common error when using the mail() function in PHP is not setting the correct headers for the email, such as the From address or Content-Type. To solve this issue, make sure to include the necessary headers in the mail() function call. Another common error is not properly formatting the email message, which can result in the email not being sent or being displayed incorrectly. To fix this, ensure that the message content is properly formatted and structured.

$to = "recipient@example.com";
$subject = "Test Email";
$message = "This is a test email message.";
$headers = "From: sender@example.com\r\n";
$headers .= "Content-Type: text/html; charset=UTF-8\r\n";

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