A problem when Check MX Record in my zimbra console

My server is very oki :D, all email send out or in is oki, but when i Click on Check MX record in zimbra console i see and error popup like below
My system have 2 server, one is MTA server (gateway.zimbra.xxx.net), one is mailbox (mailbox.zimbra.xxx.net), i use ubuntu server 10.04

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webmail.zimbra.xxx.net is my webmail :)

Pls let me know, Is that a serious problem or... this is not a problem (because my system seem to be good)


Thanks you!

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