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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)?<br />
<br />
Does this happen all of the time or just sometimes?
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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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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.<br />
as @Paka requested to you please post the NDR here that will be easier to help you out.
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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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happens sometimes not always,<br />
what is NDR &nbsp;and how can i put it here??
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happens sometimes not always,
what is NDR  and how can i put it here??

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

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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??? 




Domain/email issue

Network security consists of the policies adopted to prevent and monitor authorized access, misuse, modification, or denial of a computer network and network-accessible resources. Network security involves the authorization of access to data in a network, and covers a variety of computer networks; conducting transactions and communications among businesses, government agencies and individuals. Networks can be private, such as within a company, and others which might be open to public access.