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2 days delay NDR ISA 4.0.0 versus Exchange NDR 5.4.0

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2 days delay NDR ISA 4.0.0 versus Exchange NDR 5.4.0 - 31.May2006 10:32:29 AM   
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Joined: 31.May2006
Status: offline 		Okay ISA is not my specialism, exxchange is. And so i noticed something odd.
Where i send an Email directly to a non existing domain, i get directly an NDR 5.4.0 back in a  mailbox.
However when Exchange is configured to relay trough ISA 2000 then isa handles differently.
It replies with an NDR 4.0.0 and keeps to try it for 2 days.

In other words for exchange it's enough when a company isn't resolveable by DNS because it was a typo.
ISA in turn just keeps on trying..

is there something against this isa behavior, or is it configurable in ISA?
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