/Email deliverability/TLS / STARTTLS

TLS / STARTTLS

Check STARTTLS support, the negotiated protocol, certificate and cipher strength.

smtp › STARTTLS
Mail server or domain
Tip — type a command to jump tools:tls:mail.stripe.com
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What this checks
01Connecting on port 25
02Negotiating STARTTLS
03Reading protocol version
04Inspecting certificate
05Enumerating ciphers