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I just setup getmail with SSL. I ran the verification as suggested in the documentation:

$ openssl s_client -showcerts -connect HOST:PORT < /dev/null 2>/dev/null \
  | grep '^[[:space:]]*i:' | tail -n 1
issuer=/C=FR/ST=Paris/L=Paris/O=Gandi/CN=Gandi Standard SSL CA 2

The documentation says "If the server's certificate cannot be validated based upon the supplied trusted root certificates, getmail will abort the connection." So I assume that getmail was able to verify the server's certificate. I also successfully ran a SimplePOP3SSLRetriever with no optional parameters.

But the default location /System/Library/OpenSSL/certs/ on macOS has no files and the Keychain has no certificates installed. So I don't know which filepath to give to the optional parameter ca_certs to force verification of the server's SSL certificate.

My questions are:

  • how can I verify that SimplePOP3SSLRetriever runs on an encrypted connection?

  • where can I find a root certificate to verify the server's certificate, or how can I download a root certificate without risking of a man-in-the-middle attack?

  • how to set the ssl_fingerprints variable to verify that the server's certificate has not changed?

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