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

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?

When LISTSERV processes mail for a mailing list, it looks to see if the domain of the sender has a DMARC record has a ‘p=reject’ or ‘p=quarantine’ policy. If it does, then it rewrites the address.

LISTSERV doesn’t cache this information anywhere — it does a fresh lookup every time it distributes a message.

Additional information can be found here:

http://www.lsoft.com/manuals/17.0/advancedtopics/133HowdoesLISTSERVcomplywithDMAR.html

Thanks,

jwgh

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