Posting on behalf of Hazlitt's:

Whenever we there is an event in the area (like London Pride) or we have some building work done, we send guests emails to warn them about this. We then use one of mews classifications to mark the guests that received the emails, so we know at a glance on timeline who knows and who doesn’t!

We had a big building project last year, that overrun, and we ended up marking quite a lot of profiles. As we have another project starting soon, I wanted to clean the slate and remove all the classification we used last year, so we can reuse them for this summer’s communications!

However, with a little help from my colleagues, I managed to do this the hard way – by running the arrival report by classifications and then deleting them one by one!

Maybe this is something your developers could look into? I could definitely use another way of marking reservations or profiles as “received correspondence” type of thing.