Responses generally consist of a large amount of out of office messages, various undeliverable and error messages from remote mail servers, and the occasional a

Responses generally consist of a large amount of out of office messages, various undeliverable and error messages from remote mail servers, and the occasional auto-response which triggers your own auto-response, which triggers theirs which ends up in a mail loop that takes down email for your whole company. Many traditional businesses outsource most of their technical solutions and don't have the staff or the knowledge to deal with things like this.