Dude, my brain is not friends with my ears. It’s not psychological, my brain’s just less reliable than Siri at transcribing your voicemail. No one wants me calling them back explaining that I don’t handle the otter scriptorium inks when really they wanted a chocolate teapot.
My project is entirely phone based and we don’t have voicemail, either for the project line or individual staff lines. We used to, but we found we spent so much time returning voicemails and getting people’s voicemails that it led to us missing calls and going in an infinite loop.

It was very inefficient but I was making $3 above minimum wage and it was air conditioned. So no argument from me. They took me back for the winter break and would have had me every other summer except I did internships, so I guess I didn’t do too badly.
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.