hi we are using exchange 2003 (frontend & backend server )
mails which are send from external world hit to my frontend server but unable to deliver it to users mailbox(backend server ) & sender gets an NDR
iam able to see the external mail hits to frontend Queue & at same time NDR also gets generates from frontend which is send back to sender , although the recepients ID is valid & mailbox is also there but mails are not getting delivered to users mailbox
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