There's an equally simple reason why they do it from botnets or hacked mail servers. It's illegal in many places, and its a great way to get your mail host blac

There's an equally simple reason why they do it from botnets or hacked mail servers. It's illegal in many places, and its a great way to get your mail host blacklisted. There is no benefit whatsoever for OP to allow spamming through his service.