We had someone today that sent an inquiry about something (this person is not a client, more of an outside business partner). Dude sent, within about an hour and a half time frame, 7 emails. Calling out one person on the DL multiple times within a half hour, then proceeding to call out the rest of the DLs (ALL in the original copy list) to try to get an answer to his question.
I could see the benefit if someone needed to ask something before they left. It seems courteous?

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I find it rude, as well. If someone is emailing you (the royal you), it’s because they need something. Saying you’re just going to delete it without also giving that person a Plan B contact is totally rude. It sucks having to go through emails, it does. But it’s part of the job. In my role, I get requests from internal colleagues and from external partners. Even though I provide those partners with an alternate email to send their requests, it’s still my responsibility to make sure that the requests that were sent to me in my absence were handled. Saying “everything I’m sent will be deleted” just Would Not Fly in my industry.