No need to go into great detail that you're traveling to seven different European countries. Simply state whether you're on vacation, at a conference, or on a business trip. This will give the sender a general idea of whether you're be checking your email while you're out. "I'm currently on vacation/at a conference/on a business trip."
I meant email. The phone calls were similar, but a whole other problem. Your overdue notice? Did you discuss it with Head of Circulation (who knew the background)? No? Let me transfer you.

It is a shame it doesn’t work for people who are not saved as contacts. Hopefully Apple will realize this shortcoming at some point.
No one thinks much about cybersecurity while traveling. However, email security company Tessian warns the out of office message actually plays right into the hands of threat actors and cybercriminals. It’s a social engineering attack vector that no one thinks about. The out of office message is ubiquitous and handy. But if it includes any personal information at all — such as attending a funeral or going out of the country — attackers have all the information they need to impersonate the person who is out of the office, without the attacker having to do any real work.