Server side forward using an internal email address instead of the original email address

I have a special email address on our system that auto forwards (using delivery options) to a vendor site.  It works great for internal staff because we are all users on the vendor system.  But if the original email comes from an external person, the email never gets to the vendor system because those external people are not users on that vendor system.  We can't add external users to the vendor system due to the number of licenses.  Plus we could potentially get an email from 100,000+ external emails so it would be impossible to put them on the vendor system even if we had the licenses.  

Using the tracking log I can see that the emails coming in from external users are automatically forwarded under that external user's email address.  Is there a way to have those auto forward using an internal email address instead?  That would resolve all of my issues if the email came from an internal email box.
cindyfillerAsked:
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Hypercat (Deb)Commented:
How is the auto-forwarding email address set up - as a mailbox or as a contact?  Could you be a bit more specific, in terms of the actual settings you're using to do the forwarding?
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cindyfillerAuthor Commented:
It is set up as a mail contact
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Simon Butler (Sembee)ConsultantCommented:
There are two ways I can think of to do this.

1. Setup a rule in a mailbox to do the forwarding. Major downside of this is that you have to allow the entire org to do autoamtic forwarding - tha tis just asking for trouble.

2. Use a third party tool to do header rewriting, so that the from address is changed when sending to that vendor.

Simon.
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Hypercat (Deb)Commented:
Are all the external emails coming in to a single internal email address? If I'm understanding correctly what you described, that's the way it is being done now. So, if you use an internal mailbox to do the forwarding using the delivery options, it would be forwarded under that mailbox's address, not under the address of the external sender.
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cindyfillerAuthor Commented:
To hypercat - the email box that gets all of these forwards is for a help desk.  It is one email box that can get both internal requests for help as well as external requests for help.  I have auto forward set up in the management console / Delivery Options.  When I do the tracking - much to my surprise the original email address is the one that does the forwarding NOT the internal email address.  That is what I'm trying to accomplish.

Simon - do you recommend any programs for header rewriting?  We only need it for this one instance so I don't want to spend a ton of money on it.  I was hoping there was some setting I could change to accomplish this, but it doesn't sound like that is possible.
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Simon Butler (Sembee)ConsultantCommented:
Header rewriting is only available natively if you have an Edge Server.
You can do it with a standalone server with a transport agent.

This blog posting gives one way of doing:
http://toastresearch.com/2010/03/04/header-rewrite-on-exchange-2007-without-an-edge-server/

CodeTwo Exchange Rules Pro can do it as well I believe. It is one of those things that I know can be done, but no idea by what.

Simon.
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cindyfillerAuthor Commented:
Thanks for the info.  I used to have Exclaimer and it sounds like that will work.  But these articles gave me another idea on a transport rule that might also work.  

I'm going to award you the points, but want to ask one quick question.  I already have the forwarding working fine for internal.  I want to try this transport rule as well...  will the 2 interfere with each other or can I safely use the forwarding and the transport rule?
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Simon Butler (Sembee)ConsultantCommented:
They may well interfere. I would suggest using a second address for testing, so that you don't lose anything.
I know Exclaimer and other products can do the header rewriting - I was looking for a standalone prodcut.

Simon.
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