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What does it mean connect to aspmx.l.google.com:25: Network is unreachable?

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http://serverfault.com – I have server with RHEL 6 and postfix (postfix-2.6.6-2.2.el6), When I try to send email to Google I'm getting this in /var/logmaillog: postfix/smtp[13414]: 6F4DC10406E7: to=<[email protected]>, relay=none, delay=0.16, delays=0.02/0/0.14/0, dsn=4.4.1, status=deferred (connect to aspmx.l.google.com[2a00:1450:4013:c01::1b]:25: Network is unreachable) This error occurs only on this domain (englishonlineuniversity.com). What does it mean connect to aspmx.l.google.com:25: Network is unreachable? (HowTos)