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POP3: Post Office Protocol 3.
Comment spam: The practice of filling the comment section of popular blogs with meaningless posts containing links back to a web site.
The more popular a blog is, the more comment spam it gets.
POP (post office protocol) is a protocol defined in IETF RFC 1939 (also known as STD53) that can be used by mail clients to pick up e-mail messages from a mail delivery agent.
POP3 is the improved version and is the most widely used protocol for internet mail pickup.
Similar to pop3 in that it's a set or rules for downloading email from a mail server.
Microsoft's trade name for its proprietary e-mail management system is EXCHANGE, popular among large corporations or institutions that use Microsoft softwares.

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Ashwell Prince and AB de Villiers put South Africa in control of the second Test against England at Headingley.