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_GardnerAsked:
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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?

Regards
Valentina
1

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MaheshArchitectCommented:
that also when distribution group contains users without exchange attributes
0
Damian_GardnerAuthor 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.
0
Damian_GardnerAuthor 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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