An out of office reply is an automatic email response sent when a recipient is unavailable, such as during vacations or business trips. This message informs senders that the recipient will not respond immediately and may provide alternative contact details or a return date. While useful for communication, out of office replies can inadvertently reveal sensitive information, such as travel dates or alternative contacts. Cyber attackers may exploit these replies to confirm active email addresses, gather intelligence about an organization, or target individuals with phishing attacks. To reduce risk, avoid sharing unnecessary details in out of office messages and limit their visibility to internal contacts when possible.