When businesses want to communicate with their customers via e-mail, many send messages with a bogus return address, e.g. "somethinghere@donotreply.com." The practice is meant to communicate to recipients that any replies will go unread.

But when those messages are sent to an inactive e-mail address or the recipient ignores the instruction and replies anyway, the missives don’t just disappear into the digital ether. Instead, they land in Chet Faliszek’s e-mail box. They Told You Not To Reply - Security Fix