What is the use of the field email for expiry?

In the tab General you can enter an email address for expiry.

When an education, document or medical is about to expire, MXSuite will automatically send a notification email to the specified email address. The email will contain an overview of all available data that has expired or is about to expire.

In the configuration of the crewing module, also an office email address can be given. A copy of the notification email will be sent also to this email address.