I think it’s the other way around, when a site has dmarc with p=reject listserv does the rewrite (listserv knows this via dns lookup) and if you reply to that address then listserv is supposed to forward the reply to the correct sender.   



On Jan 17, 2022, at 2:27 PM, Peter M. Weiss <[log in to unmask]> wrote:

 When LISTSERV distributes an email from a user who's site doesn't support DMARC, it rewrites that address e.g.,

<[log in to unmask]>

Here at PSU, that bounces.

How does LISTSERV "know" to generate that kind of address: a realtime lookup of the sender's address or does it maintain a static list of such domains?

--

Pete
Sr. Systems Configurator, emeritus

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