[correction] RE: Is MARID-SUBMITTER is really necessary?

> > > This causes multiple lookups, adding to an already considerable
> > > overhead on DNS.  DMP did this too, but I'd gladly not do that
> > > if the information in SUBMITTER is available.
> > And if it is not?
> That's what Received-From: is for.
Excuse me, I meant "Resent-From:".

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