When I checked the DMARC for clovamail.com using https://mail-tester.com, it shows this message.

Your domains are not aligned. We can't check DMARC. Before using DMARC, you should make sure the domains used in the Envelope From (e.g., Return-Path or Mail-From), the "Friendly" From (i.e., "Header" From) and the d=domain in the DKIM-Signature are the same