Hi, I am quite new to zimbra.
my company installed zimbra on sub-domain while the domain used for O365. The DNS hosted on Cloudflare. All DNS running fine, but I cannot sent email to external the error is domain refused to talk to me:421. internal sending mail betweeen subdomain is OK.
kindly please advised.
- 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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