Daniel Feenberg:
so they must support it, too. I did find a newsgroup posting from someone
saying that POSTFIX did not support ENVID - the only MTA I found such
information about.
I think I'm right to say that exim doesn't do DSN at all.
I'm sure that some kind of verp might be required as a fallback, but it
occurred to me that this is the kind of thing that ENVID would be well
suited for... perhaps.
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