Dear, there is some way to block incoming emails that do not pass the DMARC, DKIM and SFP filter.
- Zimbra Collaboration 8.6 Patch 9 now available (includes fix for CVE-2017-8802). Read the announcement.
- Zimbra Collaboration 8.8.7 + Zimbra Connector for Outlook 8.8.7 are available.. Read the announcement.
- Are you a Zimbra Developer? You can find some interesting stuff in our Official GitHub: https://github.com/Zimbra and check the Community Projects too: https://github.com/Zimbra-Community/
Discuss your pilot or production implementation with other Zimbra admins or our engineers.
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You can block it manually
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