I do typically come back to hundreds of emails, and I prioritize what to read – things from my boss/leadership are first, followed by communication from my direct reports. I also sort them by conversation thread and read the end of them first, which reduces the burden.
The one that gave a personal cellphone number (they didn’t have a company phone or were required to use it for work) while out on vacation, with a comment like “I’m out on vacation from date x to date y and in my absence please contact Jane Smith but if you don’t get any joy please call my personal number if it’s urgent”.

There ought to be a word - and perhaps there is, in German - for the mix of feelings that accompanies composing and activating a holiday out-of-office message. There's smugness, of course, and a gratifying sense of laying down one's virtual tools after a horribly long shift. But for many of us, these nice feelings are tempered by the knowledge that in two weeks, refreshed but depressed, we will have to trawl through hundreds of emails, many of which will be conference room notifications for meetings about crises that have passed.
A. To best serve your customers, whether its students, alumni, consumers or other UToledo stakeholders, all department/office and individual voicemail and out-of-office email messages should let them know that UToledo is closed for winter break. Examples of messages you may want to use are below.