7.2 SR2.
https://service.jiwa.com.au/browse/DEV-6933 seems related.
There's an editable email address field (txtDebtorEmailAddress) that seemingly goes nowhere, and comes from nowhere, anything you type in there survives changing records or a refresh.
I notice that there's no email address field for QO_Main or QO_History; that's a bit of a pity, and would be the ideal use for that text box
Note: I managed to post this under 'features and enhancements'. Twice. Putting it here instead, since it seems more 'technical'.