I wonder if this reply from a riseup.net account does cause an issue, too. I suspect it doesn't cause the same issue as zoho.com does.
Hey Ralph - riseup has no dmarc policy so it shouldn't be an issue with mail list.
contrast : % dig _dmarc.riseup.com -t TXT % dig _dmarc.zoho.com -t TXT |grep -i dmarc gene