To check if your emails are correctly signed by DKIM, you can use various email authentication tools such as:
1. DKIM Validator: This is an online tool that allows you to check the DKIM signature of an email. Simply copy and paste the entire email header into the DKIM Validator field, and the tool will verify if the signature is valid or not.
1. DMARC Inspector: DMARC Inspector is another online tool that checks the DKIM signature along with SPF authentication. Paste your email header into the DMARC Inspector field, and the tool will provide you with a detailed report of the email authentication status.
1. Email Authentication Tester: This tool from Mailchimp checks the authentication status of your email using DKIM, SPF, and DMARC. All you need to do is enter your email address and send a test email to their provided address. The tool will then provide you with a report of the authentication status.
1. MX Toolbox: This tool offers a comprehensive email authentication checker that includes DKIM, SPF, and DMARC. Simply enter your domain name or email address, and the tool will perform an authentication check and provide you with a detailed report.
