diff --git a/src/ui/maillistview.cpp b/src/ui/maillistview.cpp
index 24691cf..6b95dd0 100644
--- a/src/ui/maillistview.cpp
+++ b/src/ui/maillistview.cpp
@@ -149,8 +149,6 @@ void MailListView::setupUI()
     );
     connect(m_groupByCombo, QOverload<int>::of(&QComboBox::currentIndexChanged),
             this, &MailListView::onGroupByChanged);
-    // Default to conversation grouping (Wino-style), index 2 = GroupByThread
-    m_groupByCombo->setCurrentIndex(2);
     filterLayout->addWidget(m_groupByCombo);
 
     layout->addWidget(filterBar);
@@ -248,6 +246,10 @@ void MailListView::setupUI()
     m_treeModel = new EmailTreeModel(this);
     // Wino-style default: group inbox by conversation (thread)
     m_treeModel->setGroupMode(EmailTreeModel::GroupByThread);
+    // Reflect the default in the group combo (model already set, block to avoid re-trigger)
+    m_groupByCombo->blockSignals(true);
+    m_groupByCombo->setCurrentIndex(2);  // "Agrupar por conversación"
+    m_groupByCombo->blockSignals(false);
     m_proxyModel = new QSortFilterProxyModel(this);
     m_proxyModel->setSourceModel(m_treeModel);
     m_proxyModel->setFilterCaseSensitivity(Qt::CaseInsensitive);
diff --git a/src/ui/maillistview.h b/src/ui/maillistview.h
index 25794bb..4d8bb61 100644
--- a/src/ui/maillistview.h
+++ b/src/ui/maillistview.h
@@ -106,8 +106,8 @@ private:
     QTreeView *m_treeView;
     QListView *m_listView;
     QStackedWidget *m_viewStack;
-    EmailTreeModel *m_treeModel;
-    QSortFilterProxyModel *m_proxyModel;
+    EmailTreeModel *m_treeModel = nullptr;
+    QSortFilterProxyModel *m_proxyModel = nullptr;
     QSortFilterProxyModel *m_listProxyModel;  // Separate proxy for list view using EmailListModel
     EmailListModel *m_sourceModel = nullptr;
     QPushButton *m_composeButton;