How To Enable DKIM/DomainKeys Checking/Verify for Incoming Email

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By enable DKIM/DomainKeys checking, you can reject every incoming email who did not have DKIM/DomainKeys. By default, Zimbra only configure OpenDKIM as signer. For configure OpenDKIM as verifier, you can follow these step

# Open openDKIM configuration

su - zimbra
vi /opt/zimbra/conf/opendkim.conf.in

adjust below configuration. save and exit

On-NoSignature reject
Mode sv

# Restart OpenDKIM

zmopendkimctl restart

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