I compiled and configured qpopper from the guide.pdf from qpopper homepage, and from the same guide I created CA. When I try to check mail, I get this:

Apr 23 19:36:29 kolubara popper[10830]: OpenSSL error during handshake Apr 23 19:36:29 kolubara popper[10830]: ...SSL error: error:14094418:SSL routines:SSL3_READ_BYTES:tlsv1 alert unknown ca Apr 23 19:36:29 kolubara popper[10830]: TLS/SSL Handshake failed: -1

What to do?