To verify if your DKIM is working, you can use several tools:
DKIM Validator: This tool allows you to send a test email and get a detailed report on your DKIM setup. MXToolbox: Another reliable tool to check your DKIM record and other email authentication methods like SPF and DMARC. Check your email headers: Most email clients allow you to view the email headers. Look for the "DKIM-Signature" header to ensure it is present and correctly formatted.