We have an old Exchange 2003 that did a lot of Mail-sending-without-boxes-through-software-stuff (SMTP without auth.). And shouldn't be doing it any more, but theres this one mailaddress that keeps sending e-mails through a wrong alias that gets rejected from exchange.
The Exchange ist still used for some other legacy stuff like public folders so we can't just decomission it.
So now i need to find out which piece of crapware on one computer in the network is responsible for this.
Sadly i can't seem to find the right screw that need tweeking in the exchange log-setting to tell me where the mail came from.