We've got a Linux server which has been running as a mail server (Sendmail) for years
DNS listings for SPF, DKIM, DMARC and ADSP has been in use for the past 3 months with no issues.
For DKIM we're using OpenDKIM and two days ago we've installed OpenDMARC and are still in the testing phase (We're not sending reports at this time)
For the life of me I can't figure out what I'm missing
I'm trying to figure out how to get Sendmail via OpenDMARC to follow an established policy of a received email by Rejecting or quarantining a email (as specified) if the message alignment fails .