Zimbra error 421-4.7.0 gsmtp

zimbra code error 421-4.7.0 This message does not have authentication information or fails to pass 421-4.7.0 authentication checks Gmail SMTP Error Codes

Jun 22 11:17:56 mta postfix/smtp[16523]: B67511C61EE: host gmail-smtp-in.l.google.com[74.125.23.27] said: 421-4.7.0 This message does not have authentication information or fails to pass 421-4.7.0 authentication checks. To best protect our users from spam, the 421-4.7.0 message has been blocked. Please visit 421-4.7.0  https://support.google.com/mail/answer/81126#authentication for more 421 4.7.0 information. f7si5281662plm.92 - gsmtp (in reply to end of DATA command)

How to solve problem ( recommend of google)

1. Sign messages with DKIM
2. Publish an SPF record
3. Publish a DMARC policy

My opinion just "Sign messages with DKIM and Publish an SPF record" without Publish a DMARC policy.
Ref to check DKIM and spf use dig command

dig -t txt  C333XXX-11E4-B123-25B12331CXXXA1._domainkey domain-your.com

Or ref to check website online.

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