Honest communication, even in the form of an email auto reply, is a roadmap. It helps people understand how best to help you and, in turn, allows them to better help themselves. Straightforward expectation setting is a way to be respectful of your coworkers’ time and pressures, but most importantly, it’s a way to be respectful of and guard your time. Even if you don’t feel an intense need to be more open in your workplace correspondence, consider modeling the behavior for others who work with you or, especially, those who work for you. It’s a small change in behavior but it’s a meaningful one. And this summer is the perfect time to start.
President Eisenhower signing HR7786, changing Armistice Day to Veterans Day. From left: Alvin J. King, Wayne Richards, Arthur J. Connell, John T. Nation, Edward Rees, Richard L. Trombla, Howard W. Watts

Or, announcing a trip on social media could result in email or social media offers too good to be true. It could open the door to spoofed travel details from an airline or hotel from thieves looking for credentials. Because so many employees use the same credentials for business and pleasure, this can put the organization at risk of an attack.
I have a couple people that I work with though who set them for outside their normal work hours, like they automatically kick on at 4:30pm and off at 8am or whatever, and then there’s the one special snowflake who sets her out of office not only when she leaves for the day every day, but also when she takes her half hour lunch or her fifteen minute break, Jesus wept.