Postfix not sending email issues

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http://serverfault.com – We have tried to run the postfix and just tried a simple command to send email $ echo "test-1" | mail -s "TEst1" ****@gmail.com Below is the results of mailq. C110D80654 462 Sat Dec 29 13:33:34 [email protected] (Host or domain name not found. Name service error for name=gmail.com type=MX: Host not found, try again) Tcp traceroute results stops at 5 tcptraceroute -n alt2.gmail-smtp-in.l.google.com 587 Selected device eth0, address, port 60399 for outgoing packets Tracing the path to alt2.gmail-smtp-in.l.google.com ( on TCP port 587 (submission), (HowTos)