If you are able to log in to the Defence Gateway, you can change your recovery email yourself by logging in, to get to the Defence Gateway Homepage/Site List, clicking on "My Settings", located at the top of the page and then going "Details", under "Edit My Settings"; changing your Recovery email address, amongst other things there.

or from the Defence Gateway Log in screen - Can't log in - I can't get on my recovery email

Also please ensure your SyOps is up to date otherwise this will stop you from getting online via DII/Modnet The SPOC can help you with any issues you have with SyOps or BPS.

If you are unable to log in to do so, then you will need to raise a ticket specifying the new recovery email address you'd wish to use and ensuring you include your date of birth; so we can verify your details.