diff --git a/src/crypto/encryptemailcontroller.cpp b/src/crypto/encryptemailcontroller.cpp
index 32d96af76..f59ddf1de 100644
--- a/src/crypto/encryptemailcontroller.cpp
+++ b/src/crypto/encryptemailcontroller.cpp
@@ -1,313 +1,307 @@
 /* -*- mode: c++; c-basic-offset:4 -*-
     crypto/encryptemailcontroller.cpp
 
     This file is part of Kleopatra, the KDE keymanager
     SPDX-FileCopyrightText: 2007 Klarälvdalens Datakonsult AB
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include <config-kleopatra.h>
 
 #include "encryptemailcontroller.h"
 #include "kleopatra_debug.h"
 #include "encryptemailtask.h"
 #include "taskcollection.h"
 
 #include <crypto/gui/encryptemailwizard.h>
 
 #include <utils/input.h>
 #include <utils/output.h>
 #include <utils/kleo_assert.h>
 
 #include <Libkleo/Stl_Util>
 #include <Libkleo/KleoException>
 
 #include "emailoperationspreferences.h"
 
 #include <gpgme++/key.h>
 
 #include <KMime/HeaderParsing>
 
 #include <KLocalizedString>
 
 #include <QPointer>
 #include <QTimer>
 
 using namespace Kleo;
 using namespace Kleo::Crypto;
 using namespace Kleo::Crypto::Gui;
 using namespace GpgME;
 using namespace KMime::Types;
 
 class EncryptEMailController::Private
 {
     friend class ::Kleo::Crypto::EncryptEMailController;
     EncryptEMailController *const q;
 public:
     explicit Private(Mode mode, EncryptEMailController *qq);
 
 private:
-    void slotWizardRecipientsResolved();
     void slotWizardCanceled();
 
 private:
-    void ensureWizardCreated() const;
+    void ensureWizardCreated();
     void ensureWizardVisible();
     void cancelAllTasks();
 
     void schedule();
     std::shared_ptr<EncryptEMailTask> takeRunnable(GpgME::Protocol proto);
 
 private:
     const Mode mode;
     std::vector< std::shared_ptr<EncryptEMailTask> > runnable, completed;
     std::shared_ptr<EncryptEMailTask> cms, openpgp;
-    mutable QPointer<EncryptEMailWizard> wizard;
+    QPointer<EncryptEMailWizard> wizard;
 };
 
 EncryptEMailController::Private::Private(Mode m, EncryptEMailController *qq)
     : q(qq),
       mode(m),
       runnable(),
       cms(),
       openpgp(),
       wizard()
 {
 
 }
 
 EncryptEMailController::EncryptEMailController(const std::shared_ptr<ExecutionContext> &xc, Mode mode, QObject *p)
     : Controller(xc, p), d(new Private(mode, this))
 {
 
 }
 
 EncryptEMailController::EncryptEMailController(Mode mode, QObject *p)
     : Controller(p), d(new Private(mode, this))
 {
 
 }
 
 EncryptEMailController::~EncryptEMailController()
 {
     if (d->wizard && !d->wizard->isVisible()) {
         delete d->wizard;
     }
     //d->wizard->close(); ### ?
 }
 
 EncryptEMailController::Mode EncryptEMailController::mode() const
 {
     return d->mode;
 }
 
 void EncryptEMailController::setProtocol(Protocol proto)
 {
     d->ensureWizardCreated();
     const Protocol protocol = d->wizard->presetProtocol();
     kleo_assert(protocol == UnknownProtocol ||
                 protocol == proto);
 
     d->wizard->setPresetProtocol(proto);
 }
 
-Protocol EncryptEMailController::protocol() const
+Protocol EncryptEMailController::protocol()
 {
     d->ensureWizardCreated();
     return d->wizard->selectedProtocol();
 }
 
-const char *EncryptEMailController::protocolAsString() const
+const char *EncryptEMailController::protocolAsString()
 {
     switch (protocol()) {
     case OpenPGP: return "OpenPGP";
     case CMS:     return "CMS";
     default:
         throw Kleo::Exception(gpg_error(GPG_ERR_INTERNAL),
                               i18n("Call to EncryptEMailController::protocolAsString() is ambiguous."));
     }
 }
 
 void EncryptEMailController::startResolveRecipients()
 {
     startResolveRecipients(std::vector<Mailbox>(), std::vector<Mailbox>());
 }
 
 void EncryptEMailController::startResolveRecipients(const std::vector<Mailbox> &recipients, const std::vector<Mailbox> &senders)
 {
     d->ensureWizardCreated();
     d->wizard->setRecipients(recipients, senders);
     d->ensureWizardVisible();
 }
 
-void EncryptEMailController::Private::slotWizardRecipientsResolved()
-{
-    Q_EMIT q->recipientsResolved();
-}
-
 void EncryptEMailController::Private::slotWizardCanceled()
 {
     q->setLastError(gpg_error(GPG_ERR_CANCELED), i18n("User cancel"));
     q->emitDoneOrError();
 }
 
 void EncryptEMailController::setInputAndOutput(const std::shared_ptr<Input> &input, const std::shared_ptr<Output> &output)
 {
     setInputsAndOutputs(std::vector< std::shared_ptr<Input> >(1, input), std::vector< std::shared_ptr<Output> >(1, output));
 }
 
 void EncryptEMailController::setInputsAndOutputs(const std::vector< std::shared_ptr<Input> > &inputs, const std::vector< std::shared_ptr<Output> > &outputs)
 {
 
     kleo_assert(!inputs.empty());
     kleo_assert(outputs.size() == inputs.size());
 
     std::vector< std::shared_ptr<EncryptEMailTask> > tasks;
     tasks.reserve(inputs.size());
 
     d->ensureWizardCreated();
 
     const std::vector<Key> keys = d->wizard->resolvedCertificates();
     kleo_assert(!keys.empty());
 
     for (unsigned int i = 0, end = inputs.size(); i < end; ++i) {
 
         const std::shared_ptr<EncryptEMailTask> task(new EncryptEMailTask);
         task->setInput(inputs[i]);
         task->setOutput(outputs[i]);
         if (d->mode == ClipboardMode) {
             task->setAsciiArmor(true);
         }
         task->setRecipients(keys);
 
         tasks.push_back(task);
     }
 
     d->runnable.swap(tasks);
 }
 
 void EncryptEMailController::start()
 {
     std::shared_ptr<TaskCollection> coll(new TaskCollection);
     std::vector<std::shared_ptr<Task> > tmp;
     std::copy(d->runnable.begin(), d->runnable.end(), std::back_inserter(tmp));
     coll->setTasks(tmp);
     d->ensureWizardCreated();
     d->wizard->setTaskCollection(coll);
     for (const std::shared_ptr<Task> &t : std::as_const(tmp)) {
         connectTask(t);
     }
     d->schedule();
 }
 
 void EncryptEMailController::Private::schedule()
 {
 
     if (!cms)
         if (const std::shared_ptr<EncryptEMailTask> t = takeRunnable(CMS)) {
             t->start();
             cms = t;
         }
 
     if (!openpgp)
         if (const std::shared_ptr<EncryptEMailTask> t = takeRunnable(OpenPGP)) {
             t->start();
             openpgp = t;
         }
 
     if (cms || openpgp) {
         return;
     }
     kleo_assert(runnable.empty());
     q->emitDoneOrError();
 }
 
 std::shared_ptr<EncryptEMailTask> EncryptEMailController::Private::takeRunnable(GpgME::Protocol proto)
 {
     const auto it = std::find_if(runnable.begin(), runnable.end(),
                        [proto](const std::shared_ptr<Kleo::Crypto::EncryptEMailTask> &task) {
                            return task->protocol() == proto;
                        });
     if (it == runnable.end()) {
         return std::shared_ptr<EncryptEMailTask>();
     }
 
     const std::shared_ptr<EncryptEMailTask> result = *it;
     runnable.erase(it);
     return result;
 }
 
 void EncryptEMailController::doTaskDone(const Task *task, const std::shared_ptr<const Task::Result> &result)
 {
     Q_UNUSED(result)
     Q_ASSERT(task);
 
     // We could just delete the tasks here, but we can't use
     // Qt::QueuedConnection here (we need sender()) and other slots
     // might not yet have executed. Therefore, we push completed tasks
     // into a burial container
 
     if (task == d->cms.get()) {
         d->completed.push_back(d->cms);
         d->cms.reset();
     } else if (task == d->openpgp.get()) {
         d->completed.push_back(d->openpgp);
         d->openpgp.reset();
     }
 
-    QTimer::singleShot(0, this, SLOT(schedule()));
+    QMetaObject::invokeMethod(this, [this]() { d->schedule(); }, Qt::QueuedConnection);
 }
 
 void EncryptEMailController::cancel()
 {
     try {
         if (d->wizard) {
             d->wizard->close();
         }
         d->cancelAllTasks();
     } catch (const std::exception &e) {
         qCDebug(KLEOPATRA_LOG) << "Caught exception: " << e.what();
     }
 }
 
 void EncryptEMailController::Private::cancelAllTasks()
 {
 
     // we just kill all runnable tasks - this will not result in
     // signal emissions.
     runnable.clear();
 
     // a cancel() will result in a call to
     if (cms) {
         cms->cancel();
     }
     if (openpgp) {
         openpgp->cancel();
     }
 }
 
-void EncryptEMailController::Private::ensureWizardCreated() const
+void EncryptEMailController::Private::ensureWizardCreated()
 {
     if (wizard) {
         return;
     }
 
     std::unique_ptr<EncryptEMailWizard> w(new EncryptEMailWizard);
     w->setAttribute(Qt::WA_DeleteOnClose);
     Kleo::EMailOperationsPreferences prefs;
     w->setQuickMode(prefs.quickEncryptEMail());
-    connect(w.get(), SIGNAL(recipientsResolved()), q, SLOT(slotWizardRecipientsResolved()), Qt::QueuedConnection);
-    connect(w.get(), SIGNAL(canceled()), q, SLOT(slotWizardCanceled()), Qt::QueuedConnection);
+    connect(w.get(), &EncryptEMailWizard::recipientsResolved, q, &EncryptEMailController::recipientsResolved, Qt::QueuedConnection);
+    connect(w.get(), &EncryptEMailWizard::canceled, q, [this]() { slotWizardCanceled(); }, Qt::QueuedConnection);
 
     wizard = w.release();
 }
 
 void EncryptEMailController::Private::ensureWizardVisible()
 {
     ensureWizardCreated();
     q->bringToForeground(wizard);
 }
 
 #include "moc_encryptemailcontroller.cpp"
 
diff --git a/src/crypto/encryptemailcontroller.h b/src/crypto/encryptemailcontroller.h
index 7a1da75bb..c24af8063 100644
--- a/src/crypto/encryptemailcontroller.h
+++ b/src/crypto/encryptemailcontroller.h
@@ -1,94 +1,91 @@
 /* -*- mode: c++; c-basic-offset:4 -*-
     crypto/encryptemailcontroller.h
 
     This file is part of Kleopatra, the KDE keymanager
     SPDX-FileCopyrightText: 2007 Klarälvdalens Datakonsult AB
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #pragma once
 
 #include <crypto/controller.h>
 
 #include <utils/pimpl_ptr.h>
 
 #include <gpgme++/global.h>
 
 #include <memory>
 #include <vector>
 
 namespace KMime
 {
 namespace Types
 {
 class Mailbox;
 }
 }
 
 namespace Kleo
 {
 
 class Input;
 class Output;
 
 namespace Crypto
 {
 
 class EncryptEMailController : public Controller
 {
     Q_OBJECT
 public:
     enum Mode {
         GpgOLMode,
         ClipboardMode,
 
         NumModes
     };
 
     explicit EncryptEMailController(Mode mode, QObject *parent = nullptr);
     explicit EncryptEMailController(const std::shared_ptr<ExecutionContext> &xc, Mode mode, QObject *parent = nullptr);
     ~EncryptEMailController() override;
 
     Mode mode() const;
 
     static const char *mementoName()
     {
         return "EncryptEMailController";
     }
 
     void setProtocol(GpgME::Protocol proto);
-    const char *protocolAsString() const;
-    GpgME::Protocol protocol() const;
+    const char *protocolAsString();
+    GpgME::Protocol protocol();
 
     void startResolveRecipients();
     void startResolveRecipients(const std::vector<KMime::Types::Mailbox> &recipients, const std::vector<KMime::Types::Mailbox> &senders);
 
     void setInputAndOutput(const std::shared_ptr<Kleo::Input>   &input,
                            const std::shared_ptr<Kleo::Output> &output);
     void setInputsAndOutputs(const std::vector< std::shared_ptr<Kleo::Input> >   &inputs,
                              const std::vector< std::shared_ptr<Kleo::Output> > &outputs);
 
     void start();
 
 public Q_SLOTS:
     void cancel();
 
 Q_SIGNALS:
     void recipientsResolved();
 
 private:
 
     void doTaskDone(const Task *task, const std::shared_ptr<const Kleo::Crypto::Task::Result> &) override;
 
     class Private;
     kdtools::pimpl_ptr<Private> d;
-    Q_PRIVATE_SLOT(d, void slotWizardRecipientsResolved())
-    Q_PRIVATE_SLOT(d, void slotWizardCanceled())
-    Q_PRIVATE_SLOT(d, void schedule())
 };
 
 } // Crypto
 } // Kleo