This is true! The nuclear option also helps the recently returned vacationer understand what is a priority and what isn’t. But, as boyd wrote, “if you just turn off your email with no warning, you're bound to piss off your friends, family, colleagues, and clients.” The blog post offers some helpful steps to make a clean break feasible — they include communicating with colleagues about the sabbatical long in advance, managing expectations of those who rely on you, creating a backdoor for true emergencies, and then, right before going away, reminding everyone about the sabbatical once again.
I know I’m supposed to say that I’ll have limited access to email and won’t be able to respond until I return — but that’s not true. My blackberry will be with me and I can respond if I need to. And I recognize that I’ll probably need to interrupt my vacation from time to time to deal with something urgent.

Education Details: An out of office message is a compact text that conveys the most important facts: How long you’ll be unreachable, when your contacts can expect an answer, (optionally) the reason for the absence, and, if necessary, a personal note. A referral to another email address, e.g. to one of your colleagues, is often helpful or even necessary.
By the way, [Name], our [Title], will be giving a speech sharing unique experience in [field]. I think you’ll enjoy it.