From: Scott on
internal exchange error #550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found
## - external to internal ok

Outlook 2007
Exchange 2007

User1(a) has a mailbox on exchange.
User2(a) has a mailbox on exchange.
User 1 Outlook is configured to use exchange accounts.
When sending fron scott(a) to user2(a) , mail
When sending from user1(a) to user2(a) i get the error
The recipient's e-mail address was not found in the recipient's e-mail
system. Microsoft Exchange will not try to redeliver this message for you.
Please check the e-mail address and try resending this message, or provide
the following diagnostic text to your system administrator.

#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##

Diagnostic information for administrators:

Generating server:

#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##

Original message headers:

Received: from by SERVER.domain.COM
with mapi; Wed, 10 Feb 2010 14:58:09 +0000
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: "user1(a)"
To: "user2(a)"
<IMCEAEX-_O=domainGROUP_OU=FIRST+20ADMINISTRATIVE+20GROUP_CN=RECIPIENTS_CN=USER1(a)>Date: Wed, 10 Feb 2010 14:58:08 +0000----------------------------------------------------------No problem sending email externally from ANYDOMAIN to user2(a) problem sending email to any other user from internal to internal.Occationally when user2(a) emails user1(a) we can reply touser2(a) diretly.Its almost as if the path for the reply is open for a short space of time,i.e maybe the connection to a service is open for a period of time.Creating a new email always failes.Everything is routerd via this single E2k7 service.Single internal domain user 2003 server AD.Recent migration from E2K3 to E2K7 saw me migrate USER2 mailbox to E2K7,then back to E2K3, then delete from E2k3, setup a new, delete AD user,create a new AD user with same name, create new E2k7 mailbox. User appearedin disconnected mailbox list in E2k7, was then removed using this link( you for any helpScott