Hi Lorraine, thanks for submitting a feature request.

I've merged your other post to similar one so we can upvote it a little more.

Unfortunately there's no way to do this via the History page directly for now, but to assess delivery rates for campaigns, you can use the Export functionality found on the far right. In the csv, you'd be looking for the custom_string field, and that would give you the campaign IDs for which each message is related to.