LSoft LISTSERV supports full DMARC compliance.
For DKIM setup, see https://www.lsoft.com/manuals/17.0/advancedtopics/Section12UsingDomainKeysIdentifi.html and Contact LISTSERV support for further guidance.
For SPF setup, see https://www.lsoft.com/resources/tips/configuring-spf-dkim-dmarc-for-your-listserv-site.asp and Contact LISTSERV support for further guidance.