diff --git a/mail-detail/domain/src/main/kotlin/ch/protonmail/android/maildetail/domain/usecase/IsShowSingleMessageMode.kt b/mail-detail/domain/src/main/kotlin/ch/protonmail/android/maildetail/domain/usecase/IsShowSingleMessageMode.kt
index a67d83362f..421585d6e7 100644
--- a/mail-detail/domain/src/main/kotlin/ch/protonmail/android/maildetail/domain/usecase/IsShowSingleMessageMode.kt
+++ b/mail-detail/domain/src/main/kotlin/ch/protonmail/android/maildetail/domain/usecase/IsShowSingleMessageMode.kt
@@ -18,22 +18,14 @@
 
 package ch.protonmail.android.maildetail.domain.usecase
 
-import ch.protonmail.android.mailfeatureflags.domain.annotation.IsMessageDetailEnabled
-import ch.protonmail.android.mailfeatureflags.domain.model.FeatureFlag
 import ch.protonmail.android.maillabel.domain.model.ViewMode
 import ch.protonmail.android.mailsettings.domain.usecase.GetUserPreferredViewMode
 import me.proton.core.domain.entity.UserId
 import javax.inject.Inject
 
 class IsShowSingleMessageMode @Inject constructor(
-    @IsMessageDetailEnabled private val isMessageDetailFeatureEnabled: FeatureFlag<Boolean>,
     private val getUserPreferredViewMode: GetUserPreferredViewMode
 ) {
 
-    suspend operator fun invoke(userId: UserId): Boolean {
-        val isFeatureEnabled = isMessageDetailFeatureEnabled.get()
-        val isMessageViewMode = getUserPreferredViewMode(userId) == ViewMode.NoConversationGrouping
-
-        return isFeatureEnabled && isMessageViewMode
-    }
+    suspend operator fun invoke(userId: UserId) = getUserPreferredViewMode(userId) == ViewMode.NoConversationGrouping
 }
diff --git a/mail-detail/presentation/src/test/kotlin/ch/protonmail/android/maildetail/presentation/usecase/IsShowSingleMessageModeTest.kt b/mail-detail/presentation/src/test/kotlin/ch/protonmail/android/maildetail/presentation/usecase/IsShowSingleMessageModeTest.kt
index 01a785011a..be515f00b3 100644
--- a/mail-detail/presentation/src/test/kotlin/ch/protonmail/android/maildetail/presentation/usecase/IsShowSingleMessageModeTest.kt
+++ b/mail-detail/presentation/src/test/kotlin/ch/protonmail/android/maildetail/presentation/usecase/IsShowSingleMessageModeTest.kt
@@ -20,7 +20,6 @@ package ch.protonmail.android.maildetail.presentation.usecase
 
 import ch.protonmail.android.mailcommon.domain.sample.UserIdSample
 import ch.protonmail.android.maildetail.domain.usecase.IsShowSingleMessageMode
-import ch.protonmail.android.mailfeatureflags.domain.model.FeatureFlag
 import ch.protonmail.android.maillabel.domain.model.ViewMode
 import ch.protonmail.android.mailsettings.domain.usecase.GetUserPreferredViewMode
 import io.mockk.coEvery
@@ -30,49 +29,16 @@ import kotlin.test.Test
 import kotlin.test.assertFalse
 import kotlin.test.assertTrue
 
-class IsShowSingleMessageModeTest {
+internal class IsShowSingleMessageModeTest {
 
-    private val isMessageDetailFeatureEnabled = mockk<FeatureFlag<Boolean>>()
     private val getUserPreferredViewMode = mockk<GetUserPreferredViewMode>()
 
-    private val isShowSingleMessageMode = IsShowSingleMessageMode(
-        isMessageDetailFeatureEnabled,
-        getUserPreferredViewMode
-    )
-
-    @Test
-    fun `returns true when feature flag is true and preferred mode is message mode`() = runTest {
-        // Given
-        val userId = UserIdSample.Primary
-        coEvery { isMessageDetailFeatureEnabled.get() } returns true
-        coEvery { getUserPreferredViewMode(userId) } returns ViewMode.NoConversationGrouping
-
-        // When
-        val actual = isShowSingleMessageMode(userId)
-
-        // Then
-        assertTrue(actual)
-    }
-
-    @Test
-    fun `returns false when feature flag is false`() = runTest {
-        // Given
-        val userId = UserIdSample.Primary
-        coEvery { isMessageDetailFeatureEnabled.get() } returns false
-        coEvery { getUserPreferredViewMode(userId) } returns ViewMode.NoConversationGrouping
-
-        // When
-        val actual = isShowSingleMessageMode(userId)
-
-        // Then
-        assertFalse(actual)
-    }
+    private val isShowSingleMessageMode = IsShowSingleMessageMode(getUserPreferredViewMode)
 
     @Test
     fun `returns false when preferred mode is conversation mode`() = runTest {
         // Given
         val userId = UserIdSample.Primary
-        coEvery { isMessageDetailFeatureEnabled.get() } returns true
         coEvery { getUserPreferredViewMode(userId) } returns ViewMode.ConversationGrouping
 
         // When
@@ -81,4 +47,17 @@ class IsShowSingleMessageModeTest {
         // Then
         assertFalse(actual)
     }
+
+    @Test
+    fun `returns true when preferred mode is message mode`() = runTest {
+        // Given
+        val userId = UserIdSample.Primary
+        coEvery { getUserPreferredViewMode(userId) } returns ViewMode.NoConversationGrouping
+
+        // When
+        val actual = isShowSingleMessageMode(userId)
+
+        // Then
+        assertTrue(actual)
+    }
 }
diff --git a/mail-featureflags/dagger/src/main/kotlin/ch/protonmail/android/mailfeatureflags/di/FeatureFlagsModule.kt b/mail-featureflags/dagger/src/main/kotlin/ch/protonmail/android/mailfeatureflags/di/FeatureFlagsModule.kt
index a8e54b86eb..2060398083 100644
--- a/mail-featureflags/dagger/src/main/kotlin/ch/protonmail/android/mailfeatureflags/di/FeatureFlagsModule.kt
+++ b/mail-featureflags/dagger/src/main/kotlin/ch/protonmail/android/mailfeatureflags/di/FeatureFlagsModule.kt
@@ -30,7 +30,6 @@ import ch.protonmail.android.mailfeatureflags.domain.annotation.IsBlackFridayWav
 import ch.protonmail.android.mailfeatureflags.domain.annotation.IsDebugInspectDbEnabled
 import ch.protonmail.android.mailfeatureflags.domain.annotation.IsInjectCssOverrideEnabled
 import ch.protonmail.android.mailfeatureflags.domain.annotation.IsLastMessageAutoExpandEnabled
-import ch.protonmail.android.mailfeatureflags.domain.annotation.IsMessageDetailEnabled
 import ch.protonmail.android.mailfeatureflags.domain.annotation.IsOnboardingUpsellEnabled
 import ch.protonmail.android.mailfeatureflags.domain.annotation.IsRestrictMessageWebViewHeightEnabled
 import ch.protonmail.android.mailfeatureflags.domain.annotation.IsShowBlockedTrackersEnabled
@@ -44,7 +43,6 @@ import ch.protonmail.android.mailfeatureflags.domain.model.FeatureFlagDefinition
 import ch.protonmail.android.mailfeatureflags.domain.model.InjectDetailCssOverrideEnabled
 import ch.protonmail.android.mailfeatureflags.domain.model.MailBlackFriday2025Enabled
 import ch.protonmail.android.mailfeatureflags.domain.model.MailBlackFriday2025Wave2Enabled
-import ch.protonmail.android.mailfeatureflags.domain.model.MessageDetailEnabled
 import ch.protonmail.android.mailfeatureflags.domain.model.OnboardingUpsellingEnabled
 import ch.protonmail.android.mailfeatureflags.domain.model.RestrictMessageWebViewHeight
 import ch.protonmail.android.mailfeatureflags.domain.model.ShowBlockedTrackers
@@ -65,16 +63,6 @@ import javax.inject.Singleton
 @InstallIn(SingletonComponent::class)
 @Suppress("TooManyFunctions")
 object FeatureFlagsModule {
-    @Provides
-    @IntoSet
-    @Singleton
-    fun provideMessageDetailEnabledDefinitions(): FeatureFlagDefinition = MessageDetailEnabled
-
-    @Provides
-    @Singleton
-    @IsMessageDetailEnabled
-    fun provideMessageDetailEnabled(factory: BooleanFeatureFlagFactory) =
-        factory.create(MessageDetailEnabled.key, false)
 
     @Provides
     @IntoSet
diff --git a/mail-featureflags/domain/src/main/kotlin/ch/protonmail/android/mailfeatureflags/domain/annotation/FeatureFlagAnnotations.kt b/mail-featureflags/domain/src/main/kotlin/ch/protonmail/android/mailfeatureflags/domain/annotation/FeatureFlagAnnotations.kt
index 20bb805a1b..3a9667d3a5 100644
--- a/mail-featureflags/domain/src/main/kotlin/ch/protonmail/android/mailfeatureflags/domain/annotation/FeatureFlagAnnotations.kt
+++ b/mail-featureflags/domain/src/main/kotlin/ch/protonmail/android/mailfeatureflags/domain/annotation/FeatureFlagAnnotations.kt
@@ -44,10 +44,6 @@ annotation class ComposerAutoCollapseQuotedTextEnabled
 @Retention(AnnotationRetention.BINARY)
 annotation class IsDebugInspectDbEnabled
 
-@Qualifier
-@Retention(AnnotationRetention.BINARY)
-annotation class IsMessageDetailEnabled
-
 @Qualifier
 @Retention(AnnotationRetention.BINARY)
 annotation class IsLastMessageAutoExpandEnabled
diff --git a/mail-featureflags/domain/src/main/kotlin/ch/protonmail/android/mailfeatureflags/domain/model/FeatureFlagDefinitionItems.kt b/mail-featureflags/domain/src/main/kotlin/ch/protonmail/android/mailfeatureflags/domain/model/FeatureFlagDefinitionItems.kt
index c789b8233c..acec4a2e84 100644
--- a/mail-featureflags/domain/src/main/kotlin/ch/protonmail/android/mailfeatureflags/domain/model/FeatureFlagDefinitionItems.kt
+++ b/mail-featureflags/domain/src/main/kotlin/ch/protonmail/android/mailfeatureflags/domain/model/FeatureFlagDefinitionItems.kt
@@ -74,14 +74,6 @@ data object ConversationDetailAutoExpandLastMessageEnabled : FeatureFlagDefiniti
     defaultValue = false
 )
 
-data object MessageDetailEnabled : FeatureFlagDefinition(
-    key = "MailAndroidV7MessageDetail",
-    name = "View Single Message Detail",
-    category = FeatureFlagCategory.Details,
-    description = "Allow to view a single message in the detail screen",
-    defaultValue = true
-)
-
 data object SwipeAutoAdvanceEnabled : FeatureFlagDefinition(
     key = "MailAndroidV7SwipeAutoAdvance",
     name = "Swipe and AutoAdvance View",