Version:           1.12.1 (using KDE 4.3.1)
Compiler:          gcc (Gentoo 4.3.2-r3 p1.6, pie-10.1.5) 4.3.2 
OS:                Linux
Installed from:    Gentoo Packages

When imaps/pop3s use SSLv3/TLS1 they do not use the SNI extension defined by RFC 4366. Enabling this would enable email providers to run multiple SSL/TLS services on a single IP without certificate validation errors.

This still needs to be implemented in Qt:
qt-x11-opensource-src-4.5.1/src/network/ssl/qsslsocket_openssl.cpp:initSslContext

with something like:

+#if OPENSSL_VERSION_NUMBER >= 0x0090806fL && !defined(OPENSSL_NO_TLSEXT)                                                                                
+       /* If SNI isn't supported, we just don't call it and fail silently,                                                                              
+        * as there's not much else we can do.                                                                                                           
+        */                                                                                                                                              
+       if ((configuration.protocol == QSsl::SslV2) &&                                                                                                            ((mode == QSslSocket::SslClientMode))
+               SSL_set_tlsext_host_name(self->ssl, q->peerName().toAscii().data());               
+#endif