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Out of ~6.5 million SMTP servers [1] on the Internet roughly 2.7 million support STARTTLS [2]. However, 1 million of them also support SSLv3 and ~200,000 still

Out of ~6.5 million SMTP servers [1] on the Internet roughly 2.7 million support STARTTLS [2]. However, 1 million of them also support SSLv3 and ~200,000 still allow SSLv2. [1] https://www.shodan.io/search?query=port%3A25 https://www.shodan.io/search?query=port%3A25 [2] https://www.shodan.io/report/PIHm43GP https://www.shodan.io/report/PIHm43GP

peter_tonoli 8y ago
And how many just use self-signed certificates?
- achillean 8y ago
  I would assume that most of the certs w/ a chain length of 1 are self-signed so around 1.6 million (out of the 2.7 million).
  - cm2187 8y ago
    And 400k with expired certificates. Depressing...