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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