All mail into and out of the enterprise is configured to pass through
the system as a gateway. On the way out, the system determines, based
on a fairly large number of criteria, which supplemental address
(es) (if any) are to be used or whether a new one is to be created.
All references to the original, "internal" address are replaced in the
header, body and certain attachments with the "correct"
supplemental address before delivery to the recipient.
On replies and messages sent back, the process is reversed.
Isn't this (an over engineered) auto-whitelist?
Brian
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