Okay, situation where C level exec has a Mac bought and put on network without IT involvement. (Yes, Know...)
Repeatedly having complaints over time of emails going out from him that are not him.
Connected via exchange 2008 server using outlook mac 2011.
Exec put own av on there...
Travels a lot and IT has nothing to do with his appliances.
Emails instances examples - over 10 email received b someone in his address book, repping time share/travel loc..
Email from him to others in address book about a deal closing.
Advice on other than ensuring exchange server I am wondering if something on mac is spoofing or setup as a smtp server?
Any suggestions on best course to address? bullet list please would be great. Thanks.