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* Do you know what the DMARC record is?
Suggested article: What is a DMARC record?
DMARC is the shorter form of Domain-based Message Authentication, Reporting, and Conformance. It is a complex method that authenticates the sender of a mail. It checks if it is sent from the right domain. DMARC also provides feedback and action policies.
The great thing about the DMARC is that thanks to it, there are a lot fewer phishing attacks.
Part of the mechanism of DMARC is reporting. You can get feedback information from all of your recipients. Use it and find out if there were problems or if somebody else is using your domain to send messages.
There is more detailed information about the DMARC records in this article!