void dumpToLog(vmime::ref<vmime::net::session> session)
{
    typedef std::vector<vmime::ref<vmime::propertySet::property> >
        PropertyList;
    PropertyList list = session->getProperties().getPropertyList();
    PropertyList::const_iterator end = list.end();
    for(PropertyList::const_iterator it = list.begin(); it != end; ++it) {
        qLog() << QString("%1 %2").arg(
            (*it)->getName().c_str()).arg((*it)->getValue().c_str());
    }

}