When you use EmailGuard for your DMARC reports, we will automatically receive and process DMARC reports on your behalf.
Sending sources are all unique sending servers (IP addresses) that are sending email on behalf of your domain.
If someone that is not authorized to send on your behalf attempts to send emails, you will be able to see all the attempts along with the IPs.
We recommend having a "quarantine" DMARC policy at a minimum to ensure your emails are always secure.
For more information about DMARC, click here.
DMARC Failures
DMARC failures happen when either your SPF or DKIM record is not valid from the perspective of your recipient. This can cause emails to be rejected and not get delivered.
If you are seeing a high number of DMARC failures, it could be that your SPF or DKIM settings are incorrect.
It can also mean that someone that is not authorized to send emails on your behalf is attempting to send them.
You can control your DMARC policy through EmailGuard to continue preventing bad actors from using your domains for malicious activity.