A few years ago I emailed a few professors about some unique aspect of my application. I’m thinking now of just leaving those out of my application. Since the email was sent a few years ago would they still have record of it? The obvious assumption is that they deleted it since it was so long ago but I hear nowadays universities keep all email correspondence, though I’m not sure how that’s possible. Do university staff regularly delete emails from people simply asking questions?
Keep in mind I’ve never actually applied, just thought about applying, so that may be one factor to consider.
Admissions might log theirs or attach them to an applicant somehow. But emails to profs are probably fine. That said, don’t lie on your app. A change in your area of interest or something is fine (kind of expected from young people). But an omission is something like a school attended is a different story.