<VirtualHost example1.com>
    TLSEngine                               on
    TLSLog                                  /var/log/proftpd/tls.log
    TLSProtocol                             SSLv23
    TLSOptions                              NoCertRequest EnableDiags NoSessionReuseRequired
    TLSVerifyClient                         off
    TLSRSACertificateFile                   /etc/apache2/ssl/cert-example1.com.pem
    TLSRSACertificateKeyFile                /etc/apache2/ssl/privkey-example1.com.pem
</VirtualHost>

<VirtualHost example2.com>
    TLSEngine                               on
    TLSLog                                  /var/log/proftpd/tls.log
    TLSProtocol                             SSLv23
    TLSOptions                              NoCertRequest EnableDiags NoSessionReuseRequired
    TLSVerifyClient                         off
    TLSRSACertificateFile                   /etc/apache2/ssl/cert-example2.com.pem
    TLSRSACertificateKeyFile                /etc/apache2/ssl/privkey-example2.com.pem
</VirtualHost>