Event ID - 254

Event Id254
SourceMSExchangeMTA
DescriptionUnable to correctly route the DN ... address using information in the gateway address routing table.The O/R address matches the local site address space.
Event InformationAccording to Microsoft:
CAUSE:
One or more recipients in the local site have additional X.400 e-mail addresses defined in their properties that duplicate the address space or spaces of the destination site for the message.
RESOLUTION:
There are two ways to resolve this problem, depending on your configuration:
If the additional e-mail addresses causing the problem were added in error, you can remove them from whatever recipients have such addresses specified. If the problem occurs suddenly, it is likely that someone has recently created or modified a recipient in the site with an additional e-mail address that duplicates the address space of the other site to which you can no longer send messages. In this case, you can try listing the mailboxes in order of date modified to try to isolate the mailboxes that were changed.
If the addresses are X.400 addresses and the address space of the other site is truly shared with the local site (up to OU4), you can enable sharing of X.400 address spaces in the Exchange Administrator program (select the "Share address space with other X.400 systems" check box in the Site Addressing object). This option should be used with care, as it disables the sanity checks and makes it possible to create undetected loops if the organization routing is not configured correctly.
Reference LinksMessages Generate Immediate NDR When Sent to Certain Sites

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