---
title: "Gratis MTA-STS-checker | DMARC Report"
description: "Controleer de MTA-STS-configuratie van elk domein. Valideer het DNS-record, het beleidsbestand, de TLS-handhavingsmodus en de geautoriseerde MX-hosts met onze gratis MTA-STS-checker."
image: "https://dmarcreport.com/images/og-default.png"
canonical: "https://dmarcreport.com/nl/tools/mta-sts-checker/"
---

## Controleer uw MTA-STS-configuratie

Voer uw domein in om zowel het DNS-record als het beleidsbestand te controleren dat op uw domein wordt gehost.

## Wat is MTA-STS?

[MTA-STS](/nl/mta-sts-hosting/) (Mail Transfer Agent Strict Transport Security) is een e-mailbeveiligingsstandaard gedefinieerd in [RFC 8461](https://www.rfc-editor.org/rfc/rfc8461) die domeinen in staat stelt te verklaren dat zij TLS-versleuteling voor inkomende e-mail ondersteunen en dat verzendende servers moeten weigeren berichten over onversleutelde verbindingen te bezorgen.

Zonder MTA-STS kan e-mail tussen servers worden onderschept via man-in-the-middle-aanvallen die de TLS-versleuteling verwijderen - zelfs als beide servers deze ondersteunen. Dit wordt een TLS-downgrade-aanval genoemd. MTA-STS voorkomt dit door verzendende servers te vertellen dat zij TLS moeten vereisen en het certificaat moeten valideren.

MTA-STS bestaat uit twee componenten: een DNS TXT-record op `_mta-sts.yourdomain.com` en een beleidsbestand gehost op `https://mta-sts.yourdomain.com/.well-known/mta-sts.txt`.

## MTA-STS-beleidsmodi

### enforce

E-mail die niet via een geldige TLS-verbinding kan worden bezorgd, wordt geweigerd. Dit is de strengste modus en biedt maximale bescherming tegen downgrade-aanvallen.

### testing

TLS-fouten worden gerapporteerd via [TLS-RPT](/nl/tls-rpt/), maar de e-mail wordt nog steeds bezorgd. Ideaal voor een eerste uitrol om problemen op te sporen voordat u gaat handhaven.

### none

MTA-STS is feitelijk uitgeschakeld. Er wordt geen TLS-vereiste gecommuniceerd naar verzendende servers. Wordt gebruikt om een eerder gepubliceerd beleid te deactiveren.

## Hoe MTA-STS werkt

### DNS-detectie

De verzendende server bevraagt `_mta-sts.yourdomain.com` voor een TXT-record dat `v=STSv1; id=20240101` bevat.

### Beleid ophalen

Als het TXT-record bestaat, haalt de afzender het beleidsbestand op van `https://mta-sts.yourdomain.com/.well-known/mta-sts.txt` via HTTPS.

### TLS-handhaving

Afhankelijk van de beleidsmodus dwingt de afzender TLS af (weigert fouten), rapporteert fouten (testing-modus) of doet niets (none-modus).

### MX-validatie

Het beleidsbestand geeft aan welke MX-hosts geldig zijn. De afzender controleert of het certificaat van de MX-server overeenkomt met een van de geautoriseerde hosts voordat het bericht wordt bezorgd.

## Referentie RFC 8461

MTA-STS is gedefinieerd in [RFC 8461](https://www.rfc-editor.org/rfc/rfc8461) (september 2018). Het vormt een aanvulling op [RFC 8460](https://www.rfc-editor.org/rfc/rfc8460) (SMTP TLS Reporting), dat inzicht biedt in TLS-verbindingsfouten.

Voorbeeld van een MTA-STS-beleidsbestand:

version: STSv1
mode: enforce
mx: mail.example.com
mx: *.example.com
max_age: 604800

## Maak uw e-mailbeveiligingsstack compleet

MTA-STS beschermt inkomende TLS. DMARC Report bewaakt uw uitgaande SPF-, DKIM- en DMARC-authenticatie in één dashboard.

[Start gratis proefperiode](https://app.dmarcreport.com/signup?plan=free)

## Beveiliging van enterpriseniveau

![G2 Leader - DMARC](https://media.mailhop.org/dmarcreport/images/g2-badges/DMARC_Leader_Leader.png)

Rated 4.8/5 on G2 · 469 verified reviews

![G2 Momentum Leader - DMARC](https://media.mailhop.org/dmarcreport/images/g2-badges/DMARC_MomentumLeader_Leader.png)

VU

Verified User in Information Technology and Services

5/5

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8/31/2022Verified on G2

RC

Ryan C.

Director

4.5/5

### "Control Centre for Email Security"

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eg

eddy g.

Director

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[Read all 469 reviews on G2 →](https://www.g2.com/products/dmarc-report/reviews)

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