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Routing mail by Sender domain (not just recipient)

Posted on 2004-08-09
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Last Modified: 2008-03-06
This could potentially be an easy question and i will feel stupid asking it but then again it might just not be possible to do in Exchange.

I am using Exchange 2003 and have a bunch of different email addresses (from user's ISP accounts) forward to my mailserver. This works fine and the users get their home email. Then, if they want to send email out from their home email account they "Send As" their home email address that i have entered into the Active Directory as a contact with them given Send As Permisions. In essence i am allowing my exchange server to spoof mail coming from their email address. This works great but i am concerned that as new SPF anti-spam policies become prevalent i need to really get mail sent from their ISP's.

Therefore, i want to be able to route all mail coming from a sender with lets say "@mindspring.com" to go to Mindspring's Mail server (and then i would use the AUTH feature to allow me to relay mail through mindspring). The only thing i cannot do right now is get Exchange to route based on the sender of the mail, not the recipient. I have never thought this was possible but i heard someone once say it was, to my disbelief. Anyone have any answers (and i challenge you all to make me feel stupid)?

Thanks a bunch,

Chris

Also, didn't really know how many point to award for this so if it isnt enough i will boost it later.
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Question by:watkinscj
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7 Comments
 

Author Comment

by:watkinscj
ID: 11755048
Just to add... I am using Routing SMTP Connectors and my first thought was the Routing Scope would look at Sender domain too but so far it has not worked
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LVL 104

Expert Comment

by:Sembee
ID: 11757632
I don't think you will get it to work. Exchange isn't designed to sort emails out in this fashion.
You might be able to get a Linux machine to do the job for you.

Furthermore you will need valid account credentials to relay email through the third party email servers. Most ISPs will not allow relaying through their servers without credentials.

Simon.
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Author Comment

by:watkinscj
ID: 11757853
Simon, I already have all the credentials i need. I have even created all the SMTP routes with the outgoing credentials. My only problem is to get Exchange to route mail out those Routing Groups based on the recipient. Your response confirms my reservations that this is might not even be possible in Exchange.
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LVL 104

Accepted Solution

by:
Sembee earned 400 total points
ID: 11772295
I don't think there is any way that you can put credentials in to Exchange for sending emails.

To be honest I think you are worrying about a non-issue.
Any ISP that puts the type of blocking that you are talking about risks alienating a lot of customers. People with their own domain name for example. Since I got my own domain name 5 years ago I haven't used the email account the ISP has provided. I have changed ISPs three or four times in that period as well.

Simon.
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