Sending to external problem

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Joined: Sat Nov 10, 2018 3:46 am

Sending to external problem

Postby acidjazs » Sat Nov 10, 2018 4:36 am

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.

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