diff --git a/packages/twenty-server/src/engine/workspace-manager/dev-seeder/data/constants/calendar-channel-data-seeds.constant.ts b/packages/twenty-server/src/engine/workspace-manager/dev-seeder/data/constants/calendar-channel-data-seeds.constant.ts
index f18158261e..c0df03b973 100644
--- a/packages/twenty-server/src/engine/workspace-manager/dev-seeder/data/constants/calendar-channel-data-seeds.constant.ts
+++ b/packages/twenty-server/src/engine/workspace-manager/dev-seeder/data/constants/calendar-channel-data-seeds.constant.ts
@@ -42,7 +42,7 @@ export const CALENDAR_CHANNEL_DATA_SEEDS: CalendarChannelDataSeed[] = [
     handle: 'tim@apple.dev',
     visibility: CalendarChannelVisibility.METADATA,
     isContactAutoCreationEnabled: true,
-    isSyncEnabled: true,
+    isSyncEnabled: false,
   },
   {
     id: CALENDAR_CHANNEL_DATA_SEED_IDS.JONY,
@@ -50,7 +50,7 @@ export const CALENDAR_CHANNEL_DATA_SEEDS: CalendarChannelDataSeed[] = [
     handle: 'jony@apple.dev',
     visibility: CalendarChannelVisibility.SHARE_EVERYTHING,
     isContactAutoCreationEnabled: true,
-    isSyncEnabled: true,
+    isSyncEnabled: false,
   },
   {
     id: CALENDAR_CHANNEL_DATA_SEED_IDS.PHIL,
@@ -58,7 +58,7 @@ export const CALENDAR_CHANNEL_DATA_SEEDS: CalendarChannelDataSeed[] = [
     handle: 'phil@apple.dev',
     visibility: CalendarChannelVisibility.METADATA,
     isContactAutoCreationEnabled: true,
-    isSyncEnabled: true,
+    isSyncEnabled: false,
   },
   {
     id: CALENDAR_CHANNEL_DATA_SEED_IDS.JANE,
@@ -66,7 +66,7 @@ export const CALENDAR_CHANNEL_DATA_SEEDS: CalendarChannelDataSeed[] = [
     handle: 'jane.austen@apple.dev',
     visibility: CalendarChannelVisibility.SHARE_EVERYTHING,
     isContactAutoCreationEnabled: true,
-    isSyncEnabled: true,
+    isSyncEnabled: false,
   },
   {
     id: CALENDAR_CHANNEL_DATA_SEED_IDS.COMPANY_MAIN,
@@ -74,7 +74,7 @@ export const CALENDAR_CHANNEL_DATA_SEEDS: CalendarChannelDataSeed[] = [
     handle: 'company-main@apple.dev',
     visibility: CalendarChannelVisibility.SHARE_EVERYTHING,
     isContactAutoCreationEnabled: true,
-    isSyncEnabled: true,
+    isSyncEnabled: false,
   },
   {
     id: CALENDAR_CHANNEL_DATA_SEED_IDS.TEAM_CALENDAR,
@@ -82,6 +82,6 @@ export const CALENDAR_CHANNEL_DATA_SEEDS: CalendarChannelDataSeed[] = [
     handle: 'team-calendar@apple.dev',
     visibility: CalendarChannelVisibility.SHARE_EVERYTHING,
     isContactAutoCreationEnabled: true,
-    isSyncEnabled: true,
+    isSyncEnabled: false,
   },
 ];
diff --git a/packages/twenty-server/src/engine/workspace-manager/dev-seeder/data/constants/message-channel-data-seeds.constant.ts b/packages/twenty-server/src/engine/workspace-manager/dev-seeder/data/constants/message-channel-data-seeds.constant.ts
index 0925195616..f7cdcd6697 100644
--- a/packages/twenty-server/src/engine/workspace-manager/dev-seeder/data/constants/message-channel-data-seeds.constant.ts
+++ b/packages/twenty-server/src/engine/workspace-manager/dev-seeder/data/constants/message-channel-data-seeds.constant.ts
@@ -59,7 +59,7 @@ export const MESSAGE_CHANNEL_DATA_SEEDS: MessageChannelDataSeed[] = [
     type: MessageChannelType.EMAIL,
     connectedAccountId: CONNECTED_ACCOUNT_DATA_SEED_IDS.TIM,
     handle: 'tim@apple.dev',
-    isSyncEnabled: true,
+    isSyncEnabled: false,
     visibility: MessageChannelVisibility.SHARE_EVERYTHING,
     syncStage: MessageChannelSyncStage.MESSAGE_LIST_FETCH_PENDING,
   },
@@ -72,7 +72,7 @@ export const MESSAGE_CHANNEL_DATA_SEEDS: MessageChannelDataSeed[] = [
     type: MessageChannelType.EMAIL,
     connectedAccountId: CONNECTED_ACCOUNT_DATA_SEED_IDS.JONY,
     handle: 'jony.ive@apple.dev',
-    isSyncEnabled: true,
+    isSyncEnabled: false,
     visibility: MessageChannelVisibility.SHARE_EVERYTHING,
     syncStage: MessageChannelSyncStage.MESSAGE_LIST_FETCH_PENDING,
   },
@@ -85,7 +85,7 @@ export const MESSAGE_CHANNEL_DATA_SEEDS: MessageChannelDataSeed[] = [
     type: MessageChannelType.EMAIL,
     connectedAccountId: CONNECTED_ACCOUNT_DATA_SEED_IDS.PHIL,
     handle: 'phil.schiler@apple.dev',
-    isSyncEnabled: true,
+    isSyncEnabled: false,
     visibility: MessageChannelVisibility.SHARE_EVERYTHING,
     syncStage: MessageChannelSyncStage.MESSAGE_LIST_FETCH_PENDING,
   },
@@ -98,7 +98,7 @@ export const MESSAGE_CHANNEL_DATA_SEEDS: MessageChannelDataSeed[] = [
     type: MessageChannelType.EMAIL,
     connectedAccountId: CONNECTED_ACCOUNT_DATA_SEED_IDS.JANE,
     handle: 'jane.austen@apple.dev',
-    isSyncEnabled: true,
+    isSyncEnabled: false,
     visibility: MessageChannelVisibility.SHARE_EVERYTHING,
     syncStage: MessageChannelSyncStage.MESSAGE_LIST_FETCH_PENDING,
   },
@@ -111,7 +111,7 @@ export const MESSAGE_CHANNEL_DATA_SEEDS: MessageChannelDataSeed[] = [
     type: MessageChannelType.EMAIL,
     connectedAccountId: CONNECTED_ACCOUNT_DATA_SEED_IDS.TIM, // Use TIM's connected account for shared inbox
     handle: 'support@apple.dev',
-    isSyncEnabled: true,
+    isSyncEnabled: false,
     visibility: MessageChannelVisibility.SHARE_EVERYTHING,
     syncStage: MessageChannelSyncStage.MESSAGE_LIST_FETCH_PENDING,
   },
@@ -124,7 +124,7 @@ export const MESSAGE_CHANNEL_DATA_SEEDS: MessageChannelDataSeed[] = [
     type: MessageChannelType.EMAIL,
     connectedAccountId: CONNECTED_ACCOUNT_DATA_SEED_IDS.TIM, // Use TIM's connected account for shared inbox
     handle: 'sales@apple.dev',
-    isSyncEnabled: true,
+    isSyncEnabled: false,
     visibility: MessageChannelVisibility.SHARE_EVERYTHING,
     syncStage: MessageChannelSyncStage.MESSAGE_LIST_FETCH_PENDING,
   },