allowing system generated variable value in email address name for exchange 2013

I have a request posed to me that I need some help with.
A website developer is generating emails from an order site that adds a variable to the address.
(example: replyto@domain.com is the main address and the system generates replyto+sdg324m9m@domain.com). We need to setup exchange to allow these address variables, but I don't even know where to start.

Does anyone know how to do this in Exchange 2013, or be able to point me in the right direction?

Thank you!

-Alan
alansidlesAsked:
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Simon Butler (Sembee)ConsultantCommented:
Not possible in Exchange. It has been requested before to the Exchange product team, but they don't consider there to be any demand.

The workaround I have done in the past is to have a private domain (@sub.example.com - where example.com is your main domain) that only Exchange and the remote server knows about (so not listed in any public DNS records) and then use a catch all process to capture any emails sent to that domain.

I would NOT advise using a catch all process on your public domain, as you will catch a lot of garbage.

Simon.
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alansidlesAuthor Commented:
Thank you Simon.
I guess another workaround would be to create a "junk" account on Gmail or somewhere like that. It really doesn't have to come directly to our domain.
I appreciate your help and suggestions very much.
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alansidlesAuthor Commented:
How do you setup a "catch all" process on exchange?
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Simon Butler (Sembee)ConsultantCommented:
This is the method.
http://technet.microsoft.com/en-gb/library/bb691132(v=exchg.141).aspx

However it requires disabling recipient filtering, which I don't like the idea of. Recipient filtering is the most effective first line of defence against spam, as a lot of spam is sent to non-valid addresses. I have clients who drop 80% or more of the email that is attempted to be delivered to them on recipient filtering alone.

Simon.
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alansidlesAuthor Commented:
Thanks again. I'll check this out. Having to work with a 3rd party developer in India on this request.  What a nightmare.
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alansidlesAuthor Commented:
I found a fantastic solution here: http://catchallagent.codeplex.com/releases/view/9982

Simple, quick and it works. You can set your "catch-all" account to only accept from certain senders to cut down on junk, and you can also forward the email to a distribution list.  For us this was the ticket. Works VERY well.
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