[exim] Q: Exim MTA as a router - callback verification

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Συντάκτης: Adam Bradley
Ημερομηνία:  
Προς: exim-users
Αντικείμενο: [exim] Q: Exim MTA as a router - callback verification
I have a situation where email delivered to a single namespace needs to be
delivered to a user who could be in one of a number of downstream system
(but we don't know which one). I was wondering if I could use "Callback
Verification" http://en.wikipedia.org/wiki/Callback_verification to achieve
this?

Ideally, I'd like to avoid the use of a look up table.

To recap, the mail flow would be as follows

(In the case where the user exists, send to the appropriate MTA)
-> user <at> mail.org => Callback Verification on recipient -> MTA hosting
1.mail.org (miss, user does not exist in this namespace)

-> MTA hosting 2.mail.org (hit! deliver to user <at> 2.mail.org)

(In the case where the user does not exist, send an NDR)
-> user <at> mail.org => Callback Verification on recipient -> MTA hosting
1.mail.org (miss, user does not exist in this namespace)

-> MTA hosting 2.mail.org (miss, send NDR)

Thanks in advance.

Sincerely,
Adam

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