You might also want to set a DMARC Policy record with appropriate 'rua' and 'ruf' email reporting addresses.
rua and ruf depend on remote mail centers being willing to send you this information (which is not always consistently done). Yet the reports might provideoccasional feedback if you are actually being spoofed. It's additional information that normally you wouldn't be able to get.(https://tools.ietf.org/html/rfc7489).
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