It's already defined in KAboutData

src/main.cpp

@@ -47,7 +47,6 @@ int main(int argc, char *argv[])
 
     aboutData.addAuthor(i18n("Laurent Montel"), i18n("Maintainer"), QStringLiteral("montel@kde.org"));
     QApplication::setWindowIcon(QIcon::fromTheme(QStringLiteral("kontact-import-wizard")));
-    aboutData.setOrganizationDomain(QByteArrayLiteral("kde.org"));
     aboutData.setProductName(QByteArrayLiteral("kmail2/import wizard"));
     KAboutData::setApplicationData(aboutData);