Exchange 2010 - Email forwarding

I have exchange 2010 Sp1 in my environment. There is a mailbox, mailbox A. When we send email to mailbox A, the same email is being forwarded by mailbox A to mailboxes B and C. I have checked, there is no forwarding enabled on mailbox A. Can anyone please tell me what can be the configuration ?
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Exchange UserSystems AdministratorAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
Check Mailbox A Outlook rules. If you do not see anything present there might be "phantom" rules that are still present after they were delete. You can check this by using MFCMAPI. Also check the users mailbox in the EMC and see if forwarding is enabled. You can also check to see if any transport rules are doing some kinb of forwarding as well.

Will.

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Don S.Commented:
This could be a local mailbox rule setup by the mailbox user on their local outlook client.
Exchange UserSystems AdministratorAuthor Commented:
There are no transport rules. And the mailbox A is a user mailbox by the name of a city that is acting as a  shared mailbox so there is no one using that mailbox A on an Outlook, everyone has got that as an attached mailbox so I doubt there might be any Outlook rule. But I will check by logging onto a separate machine from that mailbox. If we change our machine, are the Outlook rules still there ?
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Will SzymkowskiSenior Solution ArchitectCommented:
Yes the rules will be present.

Will.
Will SzymkowskiSenior Solution ArchitectCommented:
I would also check Message Tracking as well to see where the emails are coming from.

Will.
Justin StearCommented:
Don't forget to check the transport rules on the Exchange Server.
Exchange UserSystems AdministratorAuthor Commented:
Yesss !! It was a rule in Outlook. I deleted that rule and there are no forwarded emails now. Thanks alot guys !
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