“The world is serious enough as it is - people need, and usually appreciate, an unexpected moment of levity in their day,” he says, when quizzed about how recipients might respond to such an OOO. He also confides that he himself has dispensed with auto responses altogether – though not for idealistic reasons. “The last time I tried to set one up, I botched it so badly that somehow it resent every single email in my outbox from the previous year - client emails, firing notices, literally thousands of emails.”
If I got an OoO just to tell me to have a good day, I would find that person and throw water on their computer. They’re obviously not qualified to operate one.

It isn’t hard to write an out of office message. And it’s less important than learning how to write a great follow up or understanding what makes a killer subject line. But that’s just the reason why a lot of people usually underestimate what an out of office message can achieve.
My mom works part time at a library in archives, where her personal work email is also the general archives email (ie LibraryNameArchives @ email . com). She has an out of office response that replies with her work hours (since she’s the only employee in the archives) so people know when she’s in the library and can respond or when they can come in and visit her. The only frustrating thing is that her email either isn’t capable of, or she doesn’t know how to, turn off the OOO email when she’s actually in the office, or doesn’t trust that she’ll remember to turn it back on. She’ll send me an email about something, I’ll respond, I’ll get an OOO response, she’ll respond, I’ll reply, I get an OOO reply, etc etc.