Original sentence: As a result, service providers have to spend large amounts of money on system resources to make their systems capable of handling these excessive amounts of email.At the other end of the line, the receiving SMTP servers consume significant amounts of bandwidth and system resources dealing with this unwanted traffic.In some cases, more than 90% of SMTP traffic is considered to be spam.Such costs are inevitably passed on to the service providers' customers.The spammer consumes a user's bandwidth and resources without any cost.The use of botnets is sometimes perceived as theft
Edited sentence: All other anti-spam systems still require beefed-up resources to handle mail traffic, and do not address one of the most significant casualties of the spam problem: consumption of other peoples' resources.As a result, Internet service providers have to spend large amounts of money on bandwidth and system resources to make their systems capable of handling excessive amounts of traffic even though the legitimate traffic their customers use is a fraction of what they must be set up to handle.As a result, the spam epidemic costs all users of the Internet time, money, bandwidth and other resources.At the other end of the line, the receiving SMTP servers consume tremendous amounts of bandwidth and system resources dealing with this unwanted traffic.In some cases, more than 90% of SMTP traffic is considered unsolicited spam communication.It's also worth noting, that of all the anti-spam measures, only relay-blacklisting helps reduce the need for additional system resources.Spamming is also theft.The most prevalent form of spam nowadays involves the use of zombie computers to act as mail relays, for which the spammer consumes bandwidth and resources without any cost