connect to alt1.aspmx.l.google.com[2a00:1450:400c:c00::1a]:25: Network is unreachable

Hi

I have following errors in my PostFix mail queue and not able to send emails to Gmail/Google Apps users. Every other domain is receiving just fine.

	462083F91AC	2013/06/08 15:23		567 bytes	connect to alt1.aspmx.l.google.com[2a00:1450:400c:c00::1a]:25: Network is unreachable
	8EFDC3F91AB	2013/06/08 15:19		567 bytes	connect to aspmx3.googlemail.com[2a00:1450:4013:c00::1a]:25: Network is unreachable
	9A53A3F91AD	2013/06/08 15:23		568 bytes	connect to aspmx2.googlemail.com[2a00:1450:400c:c05::1b]:25: Network is unreachable 

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My server is hosted with ovh.com (Dedicated Server).

I am able to ping aspmx2.googlemail.com. See below:

ping aspmx2.googlemail.com
PING aspmx2.googlemail.com (173.194.66.27) 56(84) bytes of data.
64 bytes from we-in-f27.1e100.net (173.194.66.27): icmp_seq=1 ttl=46 time=97.7 ms
64 bytes from we-in-f27.1e100.net (173.194.66.27): icmp_seq=2 ttl=46 time=97.7 ms
64 bytes from we-in-f27.1e100.net (173.194.66.27): icmp_seq=3 ttl=46 time=97.7 ms
^C
--- aspmx2.googlemail.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2139ms
rtt min/avg/max/mdev = 97.726/97.746/97.780/0.024 ms

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I am able to telnet aspmx2.googlemail.com. See below:

telnet aspmx2.googlemail.com 25
Trying 173.194.66.27...
Connected to aspmx2.googlemail.com.
Escape character is '^]'.
220 mx.google.com ESMTP f5si1112554wix.36 - gsmtp

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Any help will be much appreciated.
sysautomationAsked:
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sysautomationConnect With a Mentor Author Commented:
I specified inet_protocols = ipv4 in postfix configuration and everything started working now.
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Sam Simon NasserCONSULTANT/DIRECTORCommented:
check here if your mail server is being blocked by google, this happen if one of the emails send spams.
http://www.rackaid.com/resources/gmail-blacklist-removal/
usually it takes 2 days for the IP to be remived from the blacklist ...

if your mail server ip is not in the black list, then we will move to something else.
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Allen FalconCEO & Pragmatic EvangelistCommented:
If you are being blocked by Google for spam, you will need to make sure you are not sending out spam (scan all of your systems for bots) and that your SPF records are in place and correct.

If they go to delist you and your domain is not clean and ready, they will drop the request and future requests will be delayed.
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sysautomationAuthor Commented:
I feel this is related to some IPV6 configuration. The message unreachable does not show this is blocked by google.
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sysautomationAuthor Commented:
inet_protocols = ipv4
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