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.
You know that I am in habit of giving you a quick reply but this time I am facing difficulty due to the reason that I have to go to attend an annual session which is mandatory for my efficient official working. Therefore, I cannot reply to you on time. I hereby submit my apology for that. After I come back from attending the session, I will respond to all of your emails within a few days, most probably I will join you on 6-01-20XX.

If you want to make sure your message gets a response ASAP when I return, please send it on July 18th. I recommend using one of our sales automation tools to schedule it now, while you’re thinking about it. 5. “I know I’m supposed to say that I’ll have limited access to email, but...”
In spite of your best efforts to notify people ahead of time, not everyone will get the notification that you're going to be shut down. Make sure that you: Post signs about the shutdown and when you will be back Change your voicemail message and have a plan for what to do if your voicemail is full: will it notify you? Is there an alternate number to call? Put together an "out of office" email that lets people who attempt to contact you know when you will be back Make sure you have a call tree for emergencies, and that everyone knows who he or she will be responsible for calling in the event of an emergency