When I was in the Marines we used a Banyan Vines network. My email was drewkime@RSCleveland@4MCD@MCRC You could wildcard any level, so for instance *@RSCleveland@4MCD@MCRC would go to my entire office. *@*@4MCD@MCRC would go to the entire District, etc.
One year for the Marine Corps Birthday some motivated young PFC decided to send birthday greetings to *@*@*@*
Banyan Vines at the time had vacation messages, but didn't yet prevent responding to the same address over and over, and didn't recognize when the thing it was responding to was itself a vacation message.
The next day, after they had shut down the entire Marine Corps network and restarted it several times, he didn't have email access any more.
One year for the Marine Corps Birthday some motivated young PFC decided to send birthday greetings to *@*@*@*
Banyan Vines at the time had vacation messages, but didn't yet prevent responding to the same address over and over, and didn't recognize when the thing it was responding to was itself a vacation message.
The next day, after they had shut down the entire Marine Corps network and restarted it several times, he didn't have email access any more.