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.
Sending to external problem
Discuss your pilot or production implementation with other Zimbra admins or our engineers.
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