Well you see, the article you read was about qmail. Qmail is another server platform. It does the same thing that sendmail does. The comparison would be like Lotus 123 and Excel are both spreadsheet programs. Sendmail is more widely used and qmail is thought to be more secure. Of course these aren't the only mail servers available.
Also, qmail-pop3d is the pop3 server. This is what allows you to 'pop' your mail account, or retrieve your mail with a client such as outlook.
-Mark
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