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Dkim works by authenticating emails using private-public key authentication, private key on the SMTP server, and the public key in the DNS zone. So this may happen if the dkim signing is not working from your SMTP server.
To fix this in webmin, Open Putty and connect to your machine, then run the following commands:
service opendkim restart
for more info about what and how DKIM works, watch the attached video: