What steps can be taken to troubleshoot and resolve DKIM validation failures related to character encoding in PHPMailer emails?

To troubleshoot and resolve DKIM validation failures related to character encoding in PHPMailer emails, ensure that the email content is properly encoded using UTF-8. You can set the CharSet property of PHPMailer to 'UTF-8' to ensure proper encoding of the email content.

// Set the CharSet property of PHPMailer to 'UTF-8'
$mail->CharSet = 'UTF-8';