On September 30, 2010, MailChannels CEO Ken Simpson talked about how email spam gets sent out onto the Internet. In video 2 of a 5-part series, he answered:
Where does spam spam come from?
The short answer, botnets through three key channels:
– directly out through email servers via port-25
– sending out through the ISP’s mail relay
– compromised webmail
Learn more about the Outbound Spam Challenge.