TLS-RPT
See whether a domain receives reports about failed encrypted mail delivery.
About TLS-RPT
What it is
TLS-RPT (TLS Reporting) is a DNS record that specifies an address where sending mail servers report problems delivering mail to your domain over an encrypted connection.
Why it matters
Without TLS-RPT you do not know if there are problems with encrypted mail delivery to you. With the report you can see whether and when TLS fails, which helps you fix configuration problems before mail starts disappearing.
Tips
- TLS-RPT is used together with MTA-STS or DANE.
- Point it at an address you actually read, e.g. rua=mailto:tls@company.com.
- The reports are in JSON format and can be numerous, filter them with a dedicated tool.
Common questions
Is TLS-RPT mandatory?
No, but it is a strong recommendation. It gives you visibility into whether your encrypted mail delivery is working as it should.
What distinguishes TLS-RPT from DMARC reports?
DMARC reports are about who is sending mail in your name. TLS-RPT is about whether mail encryption works when delivering to you.
More lookups
MX lookup
See which servers receive mail for a domain, and which provider handles it.
SPF check
Check whether a domain has an SPF record and how strictly it rejects spoofed mail.
DMARC check
See whether a domain has DMARC and which policy it uses against spoofed mail.
DKIM check
Look for DKIM signing on a domain using the most common selectors.
DNSSEC check
See whether a domain is protected with DNSSEC, that is, whether its DNS answers are signed.
TXT lookup
List all TXT records for a domain, including SPF, verifications and more.
NS lookup
See which name servers control a domain's DNS.
Blacklist check
Check whether a domain's IP address is on blacklists such as Spamhaus, Barracuda and SpamCop.
A/AAAA lookup
See which IP addresses a domain points to, both IPv4 (A) and IPv6 (AAAA).
CNAME lookup
See whether a domain is an alias that points on to another domain.
SOA lookup
See the zone's core data: primary name server, contact and serial number.
CAA lookup
See which certificate authorities are allowed to issue certificates for the domain.
Reverse DNS (PTR)
Look up which host name a domain's IP address points back to.
MTA-STS
See whether a domain requires encrypted mail delivery via MTA-STS.
BIMI
See whether a domain publishes a logo that can be shown in the recipient's inbox.
SSL certificate
Check a domain's TLS certificate: issuer, validity and expiry.
Whois
See who owns a domain, when it was registered and when it expires.
HTTP security headers
Check whether a domain's website sets important security headers.