So a user at our work ended up getting an email, which appeared to be coming from themselves. So Betty@ourdomain.com got an email from Betty@ourdomain.com. We use an Exchange server and are sitting behind Messagelabs.
I'm just curious how that happens? The other day, I did a telnet session from my machine and sent an email 'from' my colleague to himself and he was curious as to how on earth that happens?
Are these two scenarios similar at all? I merely wanted to understand the concept and technicality behind it all.
Thanks for helping