Exchange: too many invalid recipients

We're on Exchange 2010, and some of our Outlook 2010 users are getting this error below, when sometimes sending to ONLY ONE recipeint:

[Postmaster] Email Delivery Failure

This is a delivery failure notification message indicating that an email you addressed to email address :
[replaced email address for privacy]   could not be delivered. The problem appears to be :
-- Bounce - Recipient server condition

Additional information follows :
-- Too many invalid recipients

This condition occurred after 1 attempt(s) to deliver over a period of 0 hour(s).
Damian GardnerIT AdminAsked:
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Valentina PerezExchange ServersCommented:
Hi Damian,

Normally this error should be when you are sending to a distribution group. You are sending only one recipient?

This recipient exists?


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that also when distribution group contains users without exchange attributes
Damian GardnerIT AdminAuthor Commented:
sorry for my late reply.  I questioned the user sending the email, and she tells me the recipients were just herself (to copy) and the one recipient that was rejected. There were no distribution lists.
Damian GardnerIT AdminAuthor Commented:
thanks for your help guys.  I rebooted the Exchange server and everything seems to be ok now.  strange.  thanks again
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