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# Unified Messaging

Federated Core includes three systems for messaging.

### Email link

There is a full-featured IMAP/SMTP service available for any needed notifications to users.

### Container-to-Container link

There is a service for container-to-container communication allowing for complete workflow creation between SaaS applications when the native APIs are not enough.

### Optional: Matrix link

If the Matrix service is loaded, you can use it like a message-bus for application notification to users.