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Video: Where does spam come from?

By Desmond Liao | 1 minute read

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.

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