Exchange 2007 Custom Transport Agent Recipient Location
Asked By Chantry Conkle
02-Sep-10 05:55 PM
I have a large number of organizations that are on the same server that are unrelated. A particular selection of those are using Microsoft Online Encryption but the others are not.
I've written a custom transport agent to route mail from the domains that want it to the encryption servers so that mail is encrypted when it leaves our servers.
My issue is that I am having trouble with determining when an email is internal and when its external to avoid messages between these organizations being looped by the agent to the encryption back to the agent etc. until the message loop is detected and bounced.
My current way of handling this is a small list of those situations I forsee by checking address.domainpart and matching it to a list. I need to match this however against all accepted domains or determining if the recipient is outside our server and I'm having trouble finding a solution to that. The added complication is that we have some mailboxes that are on a non-exchange server meaning that some smtp traffic is still internal. We have to use an accepted domain to register those but we have some mailboxes that are being forwarded here from outside servers so just because its an accepted domain we still need to know when its an accepted domain address that is being delivered via dns lookup.
I hope I haven't overcomplicated my explanation of the issue and will clarify as needed.
I'm using vb.net for the language and this is running as a custom transport agent on an exchange 2007 server.
Thanks
Chantry
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Exchange 2007 Custom Transport Agent Recipient Location I have a large that are unrelated. A particular selection of those are using Microsoft Online Encryption but the others are not. I've written a that we have some mailboxes that are on a non-exchange server meaning that some smtp traffic is still internal. We the issue and will clarify as needed. I'm using vb.net for the language and this is running as a custom transport agent on an exchange 2007 server. Thanks Chantry Create New Account
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