Zimbra error 421-4.7.0 gsmtp

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Introduction

Encountering the Zimbra error "421 4.7.0 GSmtp" can disrupt your email communication and cause frustration. This error typically indicates issues related to Gmail's SMTP server, which can affect the delivery of emails sent from your Zimbra server. 

In this article, we will delve into the causes of the "421 4.7.0 GSmtp" error and provide step-by-step solutions to help you resolve it, ensuring smooth and uninterrupted email communication.

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.

Conclusion

Resolving the "421 4.7.0 GSmtp" error in Zimbra is essential for maintaining seamless email communication. By understanding the causes and following the solutions provided in this guide, you can effectively address this issue and prevent it from recurring. We hope this article has been informative and encourage you to explore our website for more tips and best practices in managing your Zimbra email system.thank you for reading the huuphan.com page!

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