diff --git a/packages/twenty-server/src/modules/calendar/calendar-event-import-manager/services/calendar-event-import-exception-handler.service.ts b/packages/twenty-server/src/modules/calendar/calendar-event-import-manager/services/calendar-event-import-exception-handler.service.ts
index 0bb40aa6b..1356a7773 100644
--- a/packages/twenty-server/src/modules/calendar/calendar-event-import-manager/services/calendar-event-import-exception-handler.service.ts
+++ b/packages/twenty-server/src/modules/calendar/calendar-event-import-manager/services/calendar-event-import-exception-handler.service.ts
@@ -85,7 +85,10 @@ export class CalendarEventImportErrorHandlerService {
         workspaceId,
       );
 
-      return;
+      throw new CalendarEventImportException(
+        `Unknown temporary error occurred while importing calendar events for calendar channel ${calendarChannel.id} in workspace ${workspaceId} with throttleFailureCount${calendarChannel.throttleFailureCount}`,
+        CalendarEventImportExceptionCode.UNKNOWN,
+      );
     }
 
     const calendarChannelRepository =
diff --git a/packages/twenty-server/src/modules/contact-creation-manager/services/create-company-and-contact.service.ts b/packages/twenty-server/src/modules/contact-creation-manager/services/create-company-and-contact.service.ts
index 1e918db09..a0c113483 100644
--- a/packages/twenty-server/src/modules/contact-creation-manager/services/create-company-and-contact.service.ts
+++ b/packages/twenty-server/src/modules/contact-creation-manager/services/create-company-and-contact.service.ts
@@ -84,13 +84,14 @@ export class CreateCompanyAndContactService {
     });
 
     const alreadyCreatedContactEmails: string[] = alreadyCreatedContacts?.map(
-      ({ emails }) => emails?.primaryEmail,
+      ({ emails }) => emails?.primaryEmail?.toLowerCase(),
     );
 
     const filteredContactsToCreate = uniqueContacts.filter(
       (participant) =>
-        !alreadyCreatedContactEmails.includes(participant.handle) &&
-        participant.handle.includes('@'),
+        !alreadyCreatedContactEmails.includes(
+          participant.handle.toLowerCase(),
+        ) && participant.handle.includes('@'),
     );
 
     const filteredContactsToCreateWithCompanyDomainNames =
diff --git a/packages/twenty-server/src/modules/contact-creation-manager/services/create-contact.service.ts b/packages/twenty-server/src/modules/contact-creation-manager/services/create-contact.service.ts
index d6800089b..91e3e11ec 100644
--- a/packages/twenty-server/src/modules/contact-creation-manager/services/create-contact.service.ts
+++ b/packages/twenty-server/src/modules/contact-creation-manager/services/create-contact.service.ts
@@ -51,7 +51,10 @@ export class CreateContactService {
 
       return {
         id,
-        emails: { primaryEmail: handle, additionalEmails: null },
+        emails: {
+          primaryEmail: handle.toLowerCase(),
+          additionalEmails: null,
+        },
         name: {
           firstName,
           lastName,
diff --git a/packages/twenty-server/src/modules/messaging/message-import-manager/services/messaging-messages-import.service.ts b/packages/twenty-server/src/modules/messaging/message-import-manager/services/messaging-messages-import.service.ts
index f21e0d247..10a156bf7 100644
--- a/packages/twenty-server/src/modules/messaging/message-import-manager/services/messaging-messages-import.service.ts
+++ b/packages/twenty-server/src/modules/messaging/message-import-manager/services/messaging-messages-import.service.ts
@@ -146,7 +146,7 @@ export class MessagingMessagesImportService {
         blocklist.map((blocklistItem) => blocklistItem.handle),
       );
 
-      await this.saveMessagesAndEnqueueContactCreationService.saveMessagesAndEnqueueContactCreationJob(
+      await this.saveMessagesAndEnqueueContactCreationService.saveMessagesAndEnqueueContactCreation(
         messagesToSave,
         messageChannel,
         connectedAccount,
diff --git a/packages/twenty-server/src/modules/messaging/message-import-manager/services/messaging-save-messages-and-enqueue-contact-creation.service.ts b/packages/twenty-server/src/modules/messaging/message-import-manager/services/messaging-save-messages-and-enqueue-contact-creation.service.ts
index b92f99517..3ff7efd77 100644
--- a/packages/twenty-server/src/modules/messaging/message-import-manager/services/messaging-save-messages-and-enqueue-contact-creation.service.ts
+++ b/packages/twenty-server/src/modules/messaging/message-import-manager/services/messaging-save-messages-and-enqueue-contact-creation.service.ts
@@ -36,7 +36,7 @@ export class MessagingSaveMessagesAndEnqueueContactCreationService {
     private readonly twentyORMManager: TwentyORMManager,
   ) {}
 
-  async saveMessagesAndEnqueueContactCreationJob(
+  async saveMessagesAndEnqueueContactCreation(
     messagesToSave: MessageWithParticipants[],
     messageChannel: MessageChannelWorkspaceEntity,
     connectedAccount: ConnectedAccountWorkspaceEntity,