MailThreatZero: domain settings and DMARC reports
For tenant administrators and technicians who set up and look after protected domains: adding a domain with its relay host and port, the security filters and the action on threat detection, Test Mode and domain status, the documented checks when mail is missing, and DMARC aggregate reports: switching collection on, the rua= record, reading sending sources and pass rates, what each alert means, and the safe path from p=none to p=reject.
- Level
- Intermediate
- Length
- About 50 minutes
- Contents
- 3 lessons · 1 video · final exam
- Status
- Published · updated 2 Oct 2026
- MailThreatZero
Skills you'll practise
- Add a domain with the correct relay host and port and choose its security filters and action on threat detection
- Use Test Mode and domain status to try new settings and to explain why mail is or isn't being filtered
- Switch on DMARC report collection and publish or correct a _dmarc TXT record with the right rua= address
- Interpret each DMARC alert type and decide whether it is a misconfiguration, a broken sender or spoofing
- Plan the move from p=none through p=quarantine to p=reject without breaking legitimate senders
Course outline
- 1.MailThreatZero: domain settings and DMARC reportsVideo · 2 min
- 2.Adding and configuring a domainLesson · 16 min
- 3.Test Mode, status and missing mailLesson · 14 min
- 4.DMARC reports and the road to p=rejectLesson · 20 min
- 5.MailThreatZero: domain settings and DMARC reports: knowledge checkKnowledge check · 18 questions
- 6.Final exam9 questions · passing it completes the course, so people who already know the material can test out
Sources it draws on
The lessons and questions are written from these references, so learners can go back to the original.
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