one of the key requirements of BATV would be that all in- and outbound e-mails pass the IronPort systems. We have, however, some e-mail domains, that are hosted at a different entity and internally routed to us.
For these domains, customers send their outbound mail over our infrastructure (e-mails would leave the infrastructure with the variable prvs= string prepended to the address), but inbound e-mails and therefore (in)valid bounces (DSN/NDR) would be delivered to the other entity, which in case of an invalid bounce, doesn't know the recipient (with the prepended prvs= string) and would refuse the e-mails, while invalid bounces would still be accepted -- Confusing, right! ;)
Is there a way to exclude these specific domains from the BATV?
Another question. If you have seperated your in- and outbound systems, would BATV still work and make sense. Does the "bookkeeping" of the variable prepended prvs= strings take place on the Mailflowcentral?
Thanks for you kind assistance.