Domain/email issue

hi i have exchange 2003
my domain is registered at yahoo
from some customers i didnot receive emails and they got a delivery failure message
that happens some times; 3 time aday a i got this complaint

is this issue with dns???


SawyerAsked:
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PakaCommented:
Would you please include the text of the delivery failure (ensure you mask your mailbox/domain info if you don't want it published on this forum)?

Does this happen all of the time or just sometimes?
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Madan SharmaConsultantCommented:
r u using yahoo DNS services ? if yes then this could not a DNS issue as yahoo DNS services never goes down. but if you are using your own DNS server for your domain then make sure it should be down and also try to setup max TTL time for your domain records.
as @Paka requested to you please post the NDR here that will be easier to help you out.
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SawyerAuthor Commented:
happens sometimes not always,
what is NDR  and how can i put it here??
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Madan SharmaConsultantCommented:
NDR = non delivery report i.e bounced mail which you get when mail not been delivered . copy that bounced mail and paste that here
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