Sharepoint workflow is not triggered when emails arrive in the library

I have a SharePoint library with two workflows that have been configured to fire when an item is created or modified.

I want these workflows to start automatically when an email arrives at the library, but it does not seem to happen. The e-mails arrive at the library, but nothing happens and I have to start the workflows manually. However, the workflows start automatically when you create an item for the library in SharePoint.

Do I have to configure something so that the workflows can automatically run with these emails?

Many Thanks!