diff --git a/pri/install.pri b/pri/install.pri
index b1a3f84e3..e390d0610 100644
--- a/pri/install.pri
+++ b/pri/install.pri
@@ -1,52 +1,69 @@
 # Setup all public headers, this needs to be kept in
 # sync with truly used headers.
 INSTALL_HEADERS = \
+../librssguard/3rd-party/boolinq/boolinq.h \
+../librssguard/3rd-party/mimesis/mimesis.hpp \
+../librssguard/3rd-party/mimesis/quoted-printable.hpp \
 ../librssguard/core/feeddownloader.h \
 ../librssguard/core/feedsmodel.h \
 ../librssguard/core/feedsproxymodel.h \
 ../librssguard/core/message.h \
+../librssguard/core/messagefilter.h \
 ../librssguard/core/messagesmodel.h \
+../librssguard/core/messagesmodelcache.cpp \
 ../librssguard/core/messagesmodelcache.h \
 ../librssguard/core/messagesmodelsqllayer.h \
 ../librssguard/core/messagesproxymodel.h \
 ../librssguard/definitions/definitions.h \
+../librssguard/dynamic-shortcuts \
+../librssguard/dynamic-shortcuts/dynamicshortcuts.cpp \
 ../librssguard/dynamic-shortcuts/dynamicshortcuts.h \
+../librssguard/dynamic-shortcuts/dynamicshortcutswidget.cpp \
 ../librssguard/dynamic-shortcuts/dynamicshortcutswidget.h \
-../librssguard/dynamic-shortcuts/shortcutbutton.h \
+../librssguard/dynamic-shortcuts/shortcutcatcher.cpp \
 ../librssguard/dynamic-shortcuts/shortcutcatcher.h \
 ../librssguard/exceptions/applicationexception.h \
+../librssguard/exceptions/filteringexception.h \
 ../librssguard/exceptions/ioexception.h \
 ../librssguard/gui/baselineedit.h \
 ../librssguard/gui/basetoolbar.h \
-../librssguard/gui/colorlabel.h \
+../librssguard/gui/colortoolbutton.h \
+../librssguard/gui/comboboxwithstatus.cpp \
 ../librssguard/gui/comboboxwithstatus.h \
 ../librssguard/gui/dialogs/formabout.h \
 ../librssguard/gui/dialogs/formaddaccount.h \
+../librssguard/gui/dialogs/formaddeditlabel.h \
 ../librssguard/gui/dialogs/formbackupdatabasesettings.h \
 ../librssguard/gui/dialogs/formdatabasecleanup.h \
 ../librssguard/gui/dialogs/formmain.h \
+../librssguard/gui/dialogs/formmessagefiltersmanager.h \
 ../librssguard/gui/dialogs/formrestoredatabasesettings.h \
 ../librssguard/gui/dialogs/formsettings.h \
 ../librssguard/gui/dialogs/formupdate.h \
-../librssguard/gui/dialogs/oauthlogin.h \
 ../librssguard/gui/discoverfeedsbutton.h \
 ../librssguard/gui/edittableview.h \
 ../librssguard/gui/feedmessageviewer.h \
 ../librssguard/gui/feedstoolbar.h \
 ../librssguard/gui/feedsview.h \
 ../librssguard/gui/guiutilities.h \
+../librssguard/gui/labelwithstatus.cpp \
 ../librssguard/gui/labelwithstatus.h \
+../librssguard/gui/lineeditwithstatus.cpp \
 ../librssguard/gui/lineeditwithstatus.h \
 ../librssguard/gui/locationlineedit.h \
 ../librssguard/gui/messagebox.h \
+../librssguard/gui/messagebrowser.h \
 ../librssguard/gui/messagepreviewer.h \
+../librssguard/gui/messagessearchlineedit.cpp \
 ../librssguard/gui/messagessearchlineedit.h \
 ../librssguard/gui/messagestoolbar.h \
 ../librssguard/gui/messagesview.h \
 ../librssguard/gui/messagetextbrowser.h \
 ../librssguard/gui/newspaperpreviewer.h \
 ../librssguard/gui/plaintoolbutton.h \
+../librssguard/gui/searchtextwidget.cpp \
 ../librssguard/gui/searchtextwidget.h \
+../librssguard/gui/searchtextwidget.ui \
 ../librssguard/gui/settings/settingsbrowsermail.h \
 ../librssguard/gui/settings/settingsdatabase.h \
 ../librssguard/gui/settings/settingsdownloads.h \
@@ -55,9 +72,12 @@ INSTALL_HEADERS = \
 ../librssguard/gui/settings/settingsgui.h \
 ../librssguard/gui/settings/settingslocalization.h \
 ../librssguard/gui/settings/settingspanel.h \
+../librssguard/gui/settings/settingsshortcuts.cpp \
 ../librssguard/gui/settings/settingsshortcuts.h \
+../librssguard/gui/settings/settingsshortcuts.ui \
 ../librssguard/gui/squeezelabel.h \
 ../librssguard/gui/statusbar.h \
+../librssguard/gui/styleditemdelegatewithoutfocus.cpp \
 ../librssguard/gui/styleditemdelegatewithoutfocus.h \
 ../librssguard/gui/systemtrayicon.h \
 ../librssguard/gui/tabbar.h \
@@ -69,13 +89,13 @@ INSTALL_HEADERS = \
 ../librssguard/gui/treewidget.h \
 ../librssguard/gui/webbrowser.h \
 ../librssguard/gui/webviewer.h \
+../librssguard/gui/widgetwithstatus.cpp \
 ../librssguard/gui/widgetwithstatus.h \
 ../librssguard/miscellaneous/application.h \
 ../librssguard/miscellaneous/autosaver.h \
 ../librssguard/miscellaneous/databasecleaner.h \
 ../librssguard/miscellaneous/databasefactory.h \
 ../librssguard/miscellaneous/databasequeries.h \
-../librssguard/miscellaneous/debugging.h \
 ../librssguard/miscellaneous/externaltool.h \
 ../librssguard/miscellaneous/feedreader.h \
 ../librssguard/miscellaneous/iconfactory.h \
@@ -88,13 +108,16 @@ INSTALL_HEADERS = \
 ../librssguard/miscellaneous/simplecrypt/simplecrypt.h \
 ../librssguard/miscellaneous/skinfactory.h \
 ../librssguard/miscellaneous/systemfactory.h \
+../librssguard/miscellaneous/templates.h \
 ../librssguard/miscellaneous/textfactory.h \
 ../librssguard/network-web/adblock/adblockaddsubscriptiondialog.h \
 ../librssguard/network-web/adblock/adblockdialog.h \
 ../librssguard/network-web/adblock/adblockicon.h \
 ../librssguard/network-web/adblock/adblockmanager.h \
+../librssguard/network-web/adblock/adblockmatcher.cpp \
 ../librssguard/network-web/adblock/adblockmatcher.h \
 ../librssguard/network-web/adblock/adblockrule.h \
+../librssguard/network-web/adblock/adblocksearchtree.cpp \
 ../librssguard/network-web/adblock/adblocksearchtree.h \
 ../librssguard/network-web/adblock/adblocksubscription.h \
 ../librssguard/network-web/adblock/adblocktreewidget.h \
@@ -103,11 +126,15 @@ INSTALL_HEADERS = \
 ../librssguard/network-web/downloader.h \
 ../librssguard/network-web/downloadmanager.h \
 ../librssguard/network-web/googlesuggest.h \
+../librssguard/network-web/httpresponse.cpp \
 ../librssguard/network-web/httpresponse.h \
 ../librssguard/network-web/networkfactory.h \
 ../librssguard/network-web/networkurlinterceptor.h \
+../librssguard/network-web/oauth2service.cpp \
 ../librssguard/network-web/oauth2service.h \
+../librssguard/network-web/oauthhttphandler.cpp \
 ../librssguard/network-web/oauthhttphandler.h \
+../librssguard/network-web/rssguardschemehandler.cpp \
 ../librssguard/network-web/rssguardschemehandler.h \
 ../librssguard/network-web/silentnetworkaccessmanager.h \
 ../librssguard/network-web/urlinterceptor.h \
@@ -117,11 +144,16 @@ INSTALL_HEADERS = \
 ../librssguard/qtsingleapplication/qtlockedfile.h \
 ../librssguard/qtsingleapplication/qtsingleapplication.h \
 ../librssguard/qtsingleapplication/qtsinglecoreapplication.h \
+../librssguard/services/abstract/accountcheckmodel.cpp \
 ../librssguard/services/abstract/accountcheckmodel.h \
+../librssguard/services/abstract/cacheforserviceroot.cpp \
 ../librssguard/services/abstract/cacheforserviceroot.h \
 ../librssguard/services/abstract/category.h \
 ../librssguard/services/abstract/feed.h \
 ../librssguard/services/abstract/gui/formfeeddetails.h \
+../librssguard/services/abstract/importantnode.h \
+../librssguard/services/abstract/label.h \
+../librssguard/services/abstract/labelsnode.h \
 ../librssguard/services/abstract/recyclebin.h \
 ../librssguard/services/abstract/rootitem.h \
 ../librssguard/services/abstract/serviceentrypoint.h \
@@ -130,8 +162,11 @@ INSTALL_HEADERS = \
 ../librssguard/services/gmail/gmailentrypoint.h \
 ../librssguard/services/gmail/gmailfeed.h \
 ../librssguard/services/gmail/gmailserviceroot.h \
+../librssguard/services/gmail/gui/emailrecipientcontrol.h \
 ../librssguard/services/gmail/gui/formaddeditemail.h \
+../librssguard/services/gmail/gui/formdownloadattachment.cpp \
 ../librssguard/services/gmail/gui/formdownloadattachment.h \
+../librssguard/services/gmail/gui/formdownloadattachment.ui \
 ../librssguard/services/gmail/gui/formeditgmailaccount.h \
 ../librssguard/services/gmail/network/gmailnetworkfactory.h \
 ../librssguard/services/inoreader/definitions.h \
@@ -152,6 +187,7 @@ INSTALL_HEADERS = \
 ../librssguard/services/standard/gui/formstandardcategorydetails.h \
 ../librssguard/services/standard/gui/formstandardfeeddetails.h \
 ../librssguard/services/standard/gui/formstandardimportexport.h \
+../librssguard/services/standard/jsonparser.h \
 ../librssguard/services/standard/rdfparser.h \
 ../librssguard/services/standard/rssparser.h \
 ../librssguard/services/standard/standardcategory.h \
diff --git a/resources/icons.qrc b/resources/icons.qrc
index f1dac90e4..4633dfd68 100644
--- a/resources/icons.qrc
+++ b/resources/icons.qrc
@@ -4,6 +4,7 @@
     <file>./graphics/Faenza/actions/64/back.png</file>
     <file>./graphics/Faenza/actions/64/call-start.png</file>
     <file>./graphics/Faenza/actions/64/dialog-no.png</file>
+    <file>./graphics/Faenza/actions/64/dialog-ok.png</file>
     <file>./graphics/Faenza/actions/64/dialog-yes.png</file>
     <file>./graphics/Faenza/actions/64/document-edit.png</file>
     <file>./graphics/Faenza/actions/64/document-export.png</file>
@@ -74,6 +75,7 @@
     <file>./graphics/Numix/22/actions/back.svg</file>
     <file>./graphics/Numix/22/actions/call-start.svg</file>
     <file>./graphics/Numix/22/actions/dialog-no.svg</file>
+    <file>./graphics/Numix/22/actions/dialog-ok.svg</file>
     <file>./graphics/Numix/22/actions/dialog-yes.svg</file>
     <file>./graphics/Numix/22/actions/document-edit.svg</file>
     <file>./graphics/Numix/22/actions/document-export.svg</file>
diff --git a/src/librssguard/gui/labelsmenu.cpp b/src/librssguard/gui/labelsmenu.cpp
new file mode 100644
index 000000000..c0c3b084a
--- /dev/null
+++ b/src/librssguard/gui/labelsmenu.cpp
@@ -0,0 +1,145 @@
+// For license of this file, see <project-root-folder>/LICENSE.md.
+
+#include "gui/labelsmenu.h"
+
+#include "3rd-party/boolinq/boolinq.h"
+#include "miscellaneous/application.h"
+#include "miscellaneous/databasequeries.h"
+#include "miscellaneous/iconfactory.h"
+
+#include <QCheckBox>
+#include <QKeyEvent>
+#include <QPainter>
+
+LabelsMenu::LabelsMenu(const QList<Message>& messages, const QList<Label*>& labels, QWidget* parent) : QMenu(parent) {
+  setIcon(qApp->icons()->fromTheme(QSL("tag-folder")));
+  setTitle(tr("Labels"));
+
+  if (labels.isEmpty()) {
+    QAction* act_not_labels = new QAction("No labels found");
+
+    act_not_labels->setEnabled(false);
+    addAction(act_not_labels);
+  }
+  else {
+    QSqlDatabase db = qApp->database()->connection(metaObject()->className());
+
+    for (Label* label: boolinq::from(labels).orderBy([](const Label* label) {
+      return label->title().toLower();
+    }).toStdList()) {
+
+      auto count = boolinq::from(messages).count([&db, label](const Message& msg) {
+        return DatabaseQueries::isLabelAssignedToMessage(db, label, msg);
+      });
+
+      Qt::CheckState state = Qt::CheckState::Unchecked;
+
+      if (count == messages.size()) {
+        state = Qt::CheckState::Checked;
+      }
+      else if (count > 0) {
+        state = Qt::CheckState::PartiallyChecked;
+      }
+
+      addLabelAction(label, state);
+    }
+  }
+}
+
+void LabelsMenu::keyPressEvent(QKeyEvent* event) {
+  LabelAction* act = qobject_cast<LabelAction*>(activeAction());
+
+  if (act != nullptr && event->key() == Qt::Key::Key_Space) {
+    act->toggle();
+  }
+  else {
+    QMenu::keyPressEvent(event);
+  }
+}
+
+void LabelsMenu::mousePressEvent(QMouseEvent* event) {
+  LabelAction* act = qobject_cast<LabelAction*>(activeAction());
+
+  if (act != nullptr) {
+    act->toggle();
+  }
+  else {
+    QMenu::mousePressEvent(event);
+  }
+}
+
+void LabelsMenu::mouseReleaseEvent(QMouseEvent* event) {
+  Q_UNUSED(event)
+}
+
+void LabelsMenu::addLabelAction(const Label* label, Qt::CheckState state) {
+  auto* act = new LabelAction(label, this, this);
+
+  act->setCheckState(state);
+  addAction(act);
+}
+
+LabelAction::LabelAction(const Label* label, QWidget* parent_widget, QObject* parent)
+  : QAction(parent), m_label(label), m_parentWidget(parent_widget), m_checkState(Qt::CheckState::Unchecked) {
+  setText(label->title());
+  setIconVisibleInMenu(true);
+  setIcon(label->icon());
+
+  connect(this, &LabelAction::checkStateChanged, this, &LabelAction::updateActionForState);
+  updateActionForState();
+}
+
+Qt::CheckState LabelAction::checkState() const {
+  return m_checkState;
+}
+
+void LabelAction::setCheckState(Qt::CheckState state) {
+  if (state != m_checkState) {
+    m_checkState = state;
+    emit checkStateChanged(m_checkState);
+  }
+}
+
+const Label* LabelAction::label() const {
+  return m_label;
+}
+
+void LabelAction::toggle() {
+  if (m_checkState == Qt::CheckState::Unchecked) {
+    setCheckState(Qt::CheckState::Checked);
+  }
+  else {
+    setCheckState(Qt::CheckState::Unchecked);
+  }
+}
+
+void LabelAction::updateActionForState() {
+  QColor highlight;
+
+  switch (m_checkState) {
+    case Qt::CheckState::Checked:
+      highlight = Qt::GlobalColor::green;
+      break;
+
+    case Qt::CheckState::PartiallyChecked:
+      highlight = QColor("#ff8c00");
+      break;
+
+    case Qt::CheckState::Unchecked:
+    default:
+      highlight = Qt::GlobalColor::transparent;
+      break;
+  }
+
+  QPixmap copy_icon(m_label->icon().pixmap(48, 48));
+
+  if (m_checkState != Qt::CheckState::Unchecked) {
+    QPainter paint(&copy_icon);
+
+    paint.setPen(QPen(Qt::GlobalColor::black, 4.0f));
+    paint.setBrush(highlight);
+    paint.drawRect(0, 0, 22, 22);
+  }
+
+  setIcon(copy_icon);
+}
diff --git a/src/librssguard/gui/labelsmenu.h b/src/librssguard/gui/labelsmenu.h
new file mode 100644
index 000000000..d8fe6c13c
--- /dev/null
+++ b/src/librssguard/gui/labelsmenu.h
@@ -0,0 +1,54 @@
+// For license of this file, see <project-root-folder>/LICENSE.md.
+
+#ifndef LABELSMENU_H
+#define LABELSMENU_H
+
+#include <QMenu>
+#include <QWidgetAction>
+
+#include "services/abstract/label.h"
+
+class QCheckBox;
+
+class LabelsMenu : public QMenu {
+  Q_OBJECT
+
+  public:
+    explicit LabelsMenu(const QList<Message>& messages, const QList<Label*>& labels, QWidget* parent = nullptr);
+
+  protected:
+    virtual void keyPressEvent(QKeyEvent* event);
+    virtual void mousePressEvent(QMouseEvent* event);
+    virtual void mouseReleaseEvent(QMouseEvent* event);
+
+  private:
+    void addLabelAction(const Label* label, Qt::CheckState state);
+};
+
+class LabelAction : public QAction {
+  Q_OBJECT
+
+  public:
+    explicit LabelAction(const Label* label, QWidget* parent_widget, QObject* parent);
+
+    Qt::CheckState checkState() const;
+    void setCheckState(Qt::CheckState state);
+
+    const Label* label() const;
+
+  public slots:
+    void toggle();
+
+  signals:
+    void checkStateChanged(Qt::CheckState state);
+
+  private slots:
+    void updateActionForState();
+
+  private:
+    const Label* m_label;
+    QWidget* m_parentWidget;
+    Qt::CheckState m_checkState;
+};
+
+#endif // LABELSMENU_H
diff --git a/src/librssguard/gui/messagesview.cpp b/src/librssguard/gui/messagesview.cpp
index f2d3828e9..ff20e37d4 100644
--- a/src/librssguard/gui/messagesview.cpp
+++ b/src/librssguard/gui/messagesview.cpp
@@ -6,6 +6,7 @@
 #include "core/messagesmodel.h"
 #include "core/messagesproxymodel.h"
 #include "gui/dialogs/formmain.h"
+#include "gui/labelsmenu.h"
 #include "gui/messagebox.h"
 #include "gui/styleditemdelegatewithoutfocus.h"
 #include "gui/treeviewcolumnsmenu.h"
@@ -14,6 +15,7 @@
 #include "miscellaneous/settings.h"
 #include "network-web/networkfactory.h"
 #include "network-web/webfactory.h"
+#include "services/abstract/labelsnode.h"
 #include "services/abstract/serviceroot.h"
 
 #include <QFileIconProvider>
@@ -192,31 +194,51 @@ void MessagesView::initializeContextMenu() {
   }
 
   m_contextMenu->clear();
+  QList<Message> selected_messages;
 
+  if (m_sourceModel->loadedItem() != nullptr) {
+    QModelIndexList selected_indexes = selectionModel()->selectedRows();
+    const QModelIndexList mapped_indexes = m_proxyModel->mapListToSource(selected_indexes);
+    auto rows = boolinq::from(mapped_indexes).select([](const QModelIndex& idx) {
+      return idx.row();
+    }).toStdList();
+
+    selected_messages = m_sourceModel->messagesAt(FROM_STD_LIST(QList<int>, rows));
+  }
+
+  // External tools.
   QFileIconProvider icon_provider;
-  QMenu* menu = new QMenu(tr("Open with external tool"), m_contextMenu);
+  QMenu* menu_ext_tools = new QMenu(tr("Open with external tool"), m_contextMenu);
 
-  menu->setIcon(qApp->icons()->fromTheme(QSL("document-open")));
+  menu_ext_tools->setIcon(qApp->icons()->fromTheme(QSL("document-open")));
 
   for (const ExternalTool& tool : ExternalTool::toolsFromSettings()) {
-    QAction* act_tool = new QAction(QFileInfo(tool.executable()).fileName(), menu);
+    QAction* act_tool = new QAction(QFileInfo(tool.executable()).fileName(), menu_ext_tools);
 
     act_tool->setIcon(icon_provider.icon(tool.executable()));
     act_tool->setToolTip(tool.executable());
     act_tool->setData(QVariant::fromValue(tool));
-    menu->addAction(act_tool);
+    menu_ext_tools->addAction(act_tool);
 
     connect(act_tool, &QAction::triggered, this, &MessagesView::openSelectedMessagesWithExternalTool);
   }
 
-  if (menu->actions().isEmpty()) {
+  if (menu_ext_tools->actions().isEmpty()) {
     QAction* act_not_tools = new QAction("No external tools activated");
 
     act_not_tools->setEnabled(false);
-    menu->addAction(act_not_tools);
+    menu_ext_tools->addAction(act_not_tools);
   }
 
-  m_contextMenu->addMenu(menu);
+  // Labels.
+  auto labels = m_sourceModel->loadedItem() != nullptr
+                                               ? m_sourceModel->loadedItem()->getParentServiceRoot()->labelsNode()->labels()
+                                               : QList<Label*>();
+  LabelsMenu* menu_labels = new LabelsMenu(selected_messages, labels, m_contextMenu);
+
+  // Rest.
+  m_contextMenu->addMenu(menu_ext_tools);
+  m_contextMenu->addMenu(menu_labels);
   m_contextMenu->addActions(
     QList<QAction*>()
       << qApp->mainForm()->m_ui->m_actionSendMessageViaEmail
@@ -232,13 +254,7 @@ void MessagesView::initializeContextMenu() {
       m_contextMenu->addAction(qApp->mainForm()->m_ui->m_actionRestoreSelectedMessages);
     }
 
-    QModelIndexList selected_indexes = selectionModel()->selectedRows();
-    const QModelIndexList mapped_indexes = m_proxyModel->mapListToSource(selected_indexes);
-    auto rows = boolinq::from(mapped_indexes).select([](const QModelIndex& idx) {
-      return idx.row();
-    }).toStdList();
-    auto messages = m_sourceModel->messagesAt(FROM_STD_LIST(QList<int>, rows));
-    auto extra_context_menu = m_sourceModel->loadedItem()->getParentServiceRoot()->contextMenuMessagesList(messages);
+    auto extra_context_menu = m_sourceModel->loadedItem()->getParentServiceRoot()->contextMenuMessagesList(selected_messages);
 
     if (!extra_context_menu.isEmpty()) {
       m_contextMenu->addSeparator();
diff --git a/src/librssguard/librssguard.pro b/src/librssguard/librssguard.pro
index 811c7d458..ddabb39af 100644
--- a/src/librssguard/librssguard.pro
+++ b/src/librssguard/librssguard.pro
@@ -67,6 +67,7 @@ HEADERS += core/feeddownloader.h \
            gui/feedstoolbar.h \
            gui/feedsview.h \
            gui/guiutilities.h \
+           gui/labelsmenu.h \
            gui/labelwithstatus.h \
            gui/lineeditwithstatus.h \
            gui/messagebox.h \
@@ -218,6 +219,7 @@ SOURCES += core/feeddownloader.cpp \
            gui/feedstoolbar.cpp \
            gui/feedsview.cpp \
            gui/guiutilities.cpp \
+           gui/labelsmenu.cpp \
            gui/labelwithstatus.cpp \
            gui/lineeditwithstatus.cpp \
            gui/messagebox.cpp \