Guest Lists & Search Function in Membership Management

I have an email account that is a guest to verify that guest emails have been sent, and it has been there for a few years (I know of no other way to check).  Presumably at some point this account will be deleted.  Will it be easy to add back (i.e., not rejected)?
Alternatively, could there be a function (tickbox?) that enables officers to select as to whether they receive the guest emails?

Regards
Neil Stichbury

PS: For a guest to opt-in to receive emails and then later flag the sender as a spammer is just plain wrong. Especially when the sender sends opt-out information in every email.  Many commercial enterprises work this way (opt-in - opt-out), I wonder how they handle it?