Use directly Akonadi::AgentConfigurationDialog

src/kmailtransportakonadi/plugins/CMakeLists.txt

@@ -17,6 +17,7 @@ target_link_libraries(mailtransport_akonadiplugin
     KF5::MailTransportAkonadi
     KF5::CoreAddons
     KF5::AkonadiCore
+    KF5::AkonadiWidgets
     KF5::I18n
     KF5::ConfigWidgets
     Qt::DBus

src/kmailtransportakonadi/plugins/akonadimailtransportplugin.cpp

@@ -9,6 +9,7 @@
 #include "resourcesendjob_p.h"
 #include <AkonadiCore/AgentInstanceCreateJob>
 #include <AkonadiCore/AgentManager>
+#include <AkonadiWidgets/AgentConfigurationDialog>
 #include <KPluginFactory>
 #include <MailTransport/Transport>
 
@@ -71,7 +72,9 @@ bool AkonadiMailTransportPlugin::configureTransport(const QString &identifier, M
         qCWarning(MAILTRANSPORT_AKONADI_LOG) << "Invalid resource instance" << transport->host();
         return false;
     }
-    instance.configure(parent); // Async...
+    QPointer<Akonadi::AgentConfigurationDialog> dlg = new Akonadi::AgentConfigurationDialog(instance, parent); // Async...
+    dlg->exec();
+    delete dlg;
     transport->save();
     return true; // No way to know here if the user cancelled or not.
 }