Question : Unable to deliver the message due to a recipient problem.

this occured this morning after sending a couple of email to same recipient....
We had same problem last week with 2 other recipient
There is no limit on the mailbox.
Exchange 5.5 sp4 on w2k sp3.

Hope someone can help me.

the recipients are all on the same exchange server.

Regards,
Ewout

Answer : Unable to deliver the message due to a recipient problem.

Have you tried running the DS/IS consistency adjuster?