Email server: lost connection while receiving initial server greeting (gmail only)

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http://serverfault.com – Past few days users are unable to send mail to gmail, by checking the logs I found the following error message "lost connection with gmail-smtp-in.l.google.com while receiving initial server greeting" But there are no issues while sending mail to yahoo, hotmail etc. ->Tried by disabling firewall-no success ->Tried to send by directly connecting without router-no success ->Tried telnet telnet gmail-smtp-in.l.google.com 25 Trying<br/> Connected to gmail-smtp-in.l.google.com. Escape character is '^]'. It just hangs there without sending the 220 greeting I am narrowing it (HowTos)