During the holidays we received a lot of out of office mails.
Unfortunately there are many people we didn't have on our recipient lists.
Only real clients should become our emails, but lot of them forward those emails to other company's and users (although they are not allowed).
Can someone help me to understand how does the out of office replay finds a way back to our Mailbox?
We are using Windows Server 2008 R2, Exchange 2012 and Outlook 2007.