Read this article to learn more about DKIM and DMARC.
What is DKIM?
In your organization, you may use the DomainKeys Identified Mail (DKIM) standard to help prevent spoofing on outgoing messages sent from your domain. DKIM lets an organization take responsibility for messages that are in transit.
Learn more from the Google documentation: Set up DKIM to prevent email spoofing
What is DMARC?
Domain-based Message Authentication Reporting and Conformance (DMARC) helps email senders and receivers verify incoming messages by authenticating the sender's domain. DMARC also defines the action to take on suspicious incoming messages.
Check your DNS records
If you have DKIM or DMARK enabled on your domain and you have trouble sending emails through YAMM, you can check your DMARC and DKIM configuration using this tool.
Based on the result of your search, you'll find all the required information. To explore further, follow the links to the help center articles.
If you have any questions, contact your G Suite admin or send us a request so we can investigate further.