Out of office messages can be as concise or detailed as you need but should follow a standard structure. Here are two templates you can use to create your own message.
How's that for an out-of-office message? Probably not ideal. As a working professional, emails are your lifeline. And even when you're not around to respond, you need to let senders know you're not actually ignoring them.

Agree that part time staff was odd to include here. I have no idea if you are part time. I don’t keep track of other people’s schedules. I would find it helpful to know you aren’t available the rest of the day in case I need something sooner.
Yeah, announcing you were going to delete emails unread and expecting the sender to resend when you return would NEVER fly in my office. I’d get executive complaints about that, especially if it went to a client or outside party – if a client can’t reach you, they will reach out to someone else who may not work at your organization and you lose business. I feel like this delete-it-all philosophy would only work for an entirely internal role where timelines are more relaxed, and even then, I feel it’s a bit unprofessional to foist your own catch-up work onto others, especially if they’ve been backfilling for you while you were OOO.