External dns / port

I have on lan my dns caching server on port 53, but I cant use it, because port forwarding to mail-in-a-box…
So, If I configure external dns, then port 53 isnt needed on mailinabox server. Right?

Yes, that’s right. Port 53 is only needed if the box is its own DNS server.

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Thanks for quick reply, Josh :slight_smile: