ShipCSX tools allow you to subscribe and un-subscribe to various notifications relating to the suites of tools. In Unit Train Management, you can currently opt in or out for 3 system generated emails.
If a request or reservation is changed, you can subscribe to receive either or both. You may change your selection by de-selecting it (1) and clicking 'Update' (2).
If you have the ability to release emptied trains, the system also sends an email with the details of each release. The default is that you are subscribed. You may change that by de-selecting it (1) and clicking 'Update' (2).
You can also add any others to be copied on your system-generated emails by putting the addresses in (3) and clicking 'Update'.