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dns servers

Mail delivery: DNS: Service unavailable error

Q. My mail delivery fails with DNS: Service unavailable error. How do I fix this error under Linux / UNIX operating systems?
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How To Find Out What My DNS Servers Address Is

How do I find out my DNS server addresses under Linux, UNIX, Apple OS X, MS-Windows operating system? What is my dns server IP address under MS-Windows operating systems? Can you specify a list of public DNS server for personal use or game consoles?
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