My server is very oki , 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 (, one is mailbox (, i use ubuntu server 10.04

1.png 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!