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 > > To unsubscribe from the LSTSRV-L list, click the following link: > http://peach.ease.lsoft.com/scripts/wa-PEACH.exe?SUBED1=LSTSRV-L&A=1 ############################ To unsubscribe from the LSTSRV-L list: write to: mailto:[log in to unmask] or click the following link: http://peach.ease.lsoft.com/scripts/wa-PEACH.exe?SUBED1=LSTSRV-L&A=1