OpenSSL 3 · Inspecting TLS servers
Test STARTTLS on a mail server
Connect over SMTP and upgrade to TLS.
openssl s_client -connect smtp.example.com:587 -starttls smtp
Official OpenSSL 3 documentation
OpenSSL 3 · Inspecting TLS servers
Connect over SMTP and upgrade to TLS.
openssl s_client -connect smtp.example.com:587 -starttls smtp
Official OpenSSL 3 documentation
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