Re: [Fetchmail-users] Gmail SSL cert problem

[grarpamp <gra...@gm...>]

Maybe you changed fetchmail config, [auto] updated
or changed some OS bits or CA bundle, etc we
don't know why. Maybe G2 / G3 cert lost.
And google has been changing things too.

You can get google intermediates here
https://pki.google.com/
https://pki.goog/
https://security.googleblog.com/

Or from URL's in the server cert
openssl s_client -connect pop.gmail.com:pop3s < /dev/null
openssl x509 -text -in <certfile>

Also consider fetchmail fingerprint / certfiles options
to avoid some various types of attack.

Search these things to learn more as needed.