strange email address in Exchange 2010


I have recently discovered that we have a lot of strange email addresses in our Exchange 2010.  I found this out during a simulated LDAP synchronization with GFI Mail Essentials Online.   Here is a sampling of some of the email addresses:

These users do not show up in the Active Directory Users MSC.
Any ideas what they are?   Please advise.  Thanks.
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Simon Butler (Sembee)ConsultantCommented:
Most of those are public folders, specifically public folders. The only one that I don't recognise is the "proceeds5" address. You can search the domain to see what object the address is attached to.

This should work to find the address:

Get-Recipient -resultSize unlimited | select name -expand emailAddresses | where {$_.smtpAddress -match ""}

Then do
get-recipient name

 to see what the object is.


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