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How are these &quot;incorrect&quot; addresses coming in?<br />
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Are they on the same domain? &nbsp;Old domain? &nbsp;POP3 connector?
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How are these "incorrect" addresses coming in?

Are they on the same domain?  Old domain?  POP3 connector?

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They are on the same domain through SMTP
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I would probably setup a public folder to do the autoreplies, then either have that public folder managed by a user, or better yet, get the emails forwarded from there to the users mailbox as well.<br />
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Is there 1 user that will be managing this?<br />
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-red
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I would probably setup a public folder to do the autoreplies, then either have that public folder managed by a user, or better yet, get the emails forwarded from there to the users mailbox as well.

Is there 1 user that will be managing this?

-red

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I as the administrator will be administrating this, I have limited knowledge of exchange. How would I setup a public folder to do this? I would like this to be automatic, when the setup is complete.
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I as the administrator will be administrating this, I have limited knowledge of exchange. How would I setup a public folder to do this? I would like this to be automatic, when the setup is complete.

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The overall goal of this is when a message comes in from a specific list of e-mail address, &nbsp;I need one message to go to the sender that states that they should use the company provided e-mail system. The original message passes to the inbox of the recipient, and the recipient receives an e-mail stating that the sender did not use the company provided e-mail address. <br />
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I am running Exchange 2003 on a Server 2003 environment.
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The overall goal of this is when a message comes in from a specific list of e-mail address,  I need one message to go to the sender that states that they should use the company provided e-mail system. The original message passes to the inbox of the recipient, and the recipient receives an e-mail stating that the sender did not use the company provided e-mail address. 

I am running Exchange 2003 on a Server 2003 environment.

Users are not sending e-mail using the company's e-mail system, they need a reminder ( Exchange 2003 )

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.