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MAILs QUEUING AT BOTH END OF THE EDGE AND HUB WITH ERROR 451 4.4.0 DNS query failed

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Dear All

I am having a problem with my new setup of Hub and edge setup. all the prerequisites completed successfully, and the installatin done successuflly. the new-édgesubscription done. telnet to port 25 on both ways = successful, but the surprise is that emails are not able to cross from the Hub to the edge and from the edge queue to the Hub.

The two server are connected between two countries thrugh the VPN having a Cisco Firewall on one side and a Cyberoam on the other side.

I am stuck, coz I done what I could, If any one can help.

thanks in advance

Michael


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