people cannot send spoofed emails with my domain. I'm just an enthusiastic running his mail server so no big gain. But I can see why $BIG_BANK would like to pre

people cannot send spoofed emails with my domain. I'm just an enthusiastic running his mail server so no big gain. But I can see why $BIG_BANK would like to prevent people to be able send fishing email from accounts@$BIG_BANK.com from random computers on the internet...