MTA-STS, TLS-RPT & SMTP DANE per Domain
The question it answers: Which accepted domains publish MTA-STS, TLS-RPT and DANE, and which leave mail delivery open to downgrade?
SPF, DKIM and DMARC protect who sends; MTA-STS and DANE protect the connection. Without them, senders fall back to opportunistic TLS and an attacker on the network path can downgrade or intercept mail to you. TLS-RPT tells you when that happens. MailDomainAuthentication covers SPF/DKIM/DMARC.
At a glance
Section titled “At a glance”| Where in the app | Exchange Online › Mail Security & Hygiene › MTA-STS, TLS-RPT & DANE |
| Workload | Exchange Online |
| Kind | Findings list · dashboard tile |
| Data | Read from Microsoft 365 when someone first opens it, then kept for the report cache lifetime (Settings > Data & cache, 1 hour unless changed). It reads through PowerShell (Exchange Online or SharePoint Online), so the first load takes longer than a Graph report. |
| Licence | No extra licence needed. |
| Report id (API and MCP) | exchange.hygiene.mail-transport-security |
Columns
Section titled “Columns”| Column | Key | Type |
|---|---|---|
| Severity | Severity | Status |
| Control | Category | Text |
| Domain | Subject | Link |
| Check | Setting | Text |
| Value | Value | Text |
| Finding | Finding | Text |
| MX | Detail | Text |
| Date | When | Date |
| Count | Number | Number |
A findings list hides columns that no row fills. Severity is Critical, Serious, Warning, OK or Info; rows rated Critical, Serious or Warning need attention (Working with findings).
What it needs
Section titled “What it needs”Licence: No extra licence needed.
Application permissions on the IntensiveReports app registration (all permissions):
| Permission | API | What it allows | Note |
|---|---|---|---|
Exchange.ManageAsApp | Office 365 Exchange Online | Manage Exchange As Application | + View-Only Configuration |
Roles and other setup:
- Outbound DNS and HTTPS from the web server
Data sources it reads
Get-AcceptedDomainResolve-DnsName _mta-sts / _smtp._tls TXT, MXhttps://mta-sts.{domain}/.well-known/mta-sts.txtGet-SmtpDaneInboundStatus
Through the API and MCP
Section titled “Through the API and MCP”GET /ir-api/v1/reports/exchange.hygiene.mail-transport-security?size=100An AI assistant reads it with the MCP tool get_report and the id exchange.hygiene.mail-transport-security. The client needs the Read grant for Exchange Online. See Using the API.