Any time you send out an email campaign to a list, any out of office or away message autoresponders will land in the inbox for the From Email address for that campaign send.
Out of office messages are not true replies, because no Reply button is clicked. The email is automatically sent when an email lands in the inbox. As such, the automated email by default goes to the From Email address you have used.
Click here to learn how to change your From or Reply-to email address.