On 13/04/2022 05:31, John Levine wrote: > For doing DMARC validation, I know about the opendmarc milter. Is that what > everyone uses? Is there anything else used in pratice? > > I know about perl and python libraries but they don't seem to have > milters or other ready to use integrations into MTAs.
There is rspamd. It does more than just DMARC, but seems to be in better shape than OpenDMARC. Juri