What we need in our work communication is not more professional politeness or less formal, chat-based messaging applications like Slack. We need honesty. The problem is that we’ve conditioned ourselves to see honesty as self-indulgent or disrespectful. I’d argue the opposite is true. Honesty, even if it’s a bit more inconvenient for all parties in the moment, pays dividends later. It builds trust. When my partner Anne Helen Petersen and I were interviewing people for our forthcoming book on remote work, a frequent lament from both middle managers and workers was that they didn’t feel like they knew how to succeed in their jobs; that they were guessing what their superiors and coworkers wanted and, even when they asked, they didn’t quite trust the responses they got back.
Just hang in there, the holiday break is near. Alas! You can finally disconnect, recharge, and relax.

The plan B is to send it again when they’re back though. I think there are a lot of situations where I emailed them and someone else from the start and someone else answered, or I found someone else in the 2 months span until they’re back, or did it myself, or it’s too late to help…. So it does help them avoid following up on things that don’t need following up on.
I do this when I’m on personal vacations. When I’m doing field work for research, I do tend to add a statement that I won’t have access to email/phone because I’m doing field work in X location.