Free tools
TLS-RPT checker
Enter the domain that publishes TLS-RPT (usually the same domain as your MX records).
What this checks
TLS-RPT TXT at _smtp._tls.domain, rua reporting addresses, and record syntax.
Why it matters
TLS-RPT surfaces TLS negotiation failures senders encounter when delivering to your domain — essential when rolling out MTA-STS.
Results
Common issues
- Publishing TLS-RPT without a monitored rua mailbox.
- Syntax errors in the _smtp._tls TXT record.
- Enabling MTA-STS enforce before reviewing TLS-RPT failure reports.
How to fix
- Publish a valid TLS-RPT TXT record with working aggregate report addresses.
- Review reports during MTA-STS testing mode before enforcement.
- Pair with MX and MTA-STS checks on the same domain.
How MailFleet helps
Use TLS-RPT alongside MailFleet outbound diagnostics when operating domains that both send campaigns and receive inbound mail.
Related free tools
Delivery note: MailFleet helps users manage campaigns through their own sending providers. Delivery outcomes depend on sender reputation, DNS authentication, content quality, recipient engagement, list quality, provider rules, and mailbox filtering systems.
For regulatory context on commercial email in the United States, see the FTC CAN-SPAM compliance guide.
Frequently asked questions
TLS-RPT is strongly recommended when using MTA-STS so you see TLS failures before enforcing strict policies.
Get started
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