Why is having an Open Relay Mail Server bad?
A. Spammers are the ones who most use other servers to send mail, but Open Relay Mail Servers can also be used to spread computer viruses. Spammers do not own the servers they send most of their mail through, nor do they contribute any money or labor to the upkeep of the servers. This amounts to theft and is sometimes called “high-jacking” the server. Not only does the Spammer use a piece of equipment that is not theirs, but they also hog network resources as the massive amounts of mail sent through the servers require processing time and bandwidth.
