Dns Problem Please Help

i have a problem with dns

Customer cannot send & receive mail to and from a particular domain ( only this domain have this problem) so when i checked with the exim log i found that 'host look up didn't complete'

when i tried a # dig for that domain on server i am receiving following error

; <<>> DiG 9.2.4 <<>> domain.com
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 34392
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL:

but when i checked the same domain with dns report and another local server it is not showing any error.

is this any problem with our server setting? i have installed apf and unblocked 53

what may be the problem? please suggest

Thanks in advance

 

 

 

 

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