What sources do spammers use to get email addresses?

Posted by Andrew Grimm on Super User See other posts from Super User or by Andrew Grimm
Published on 2011-03-06T00:11:21Z Indexed on 2011/03/06 0:12 UTC
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spam

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spam-prevention

From what sources do email spammers get their addresses?

Wikipedia mentions the following:

Harvesting email addresses from publicly available sources.
- This includes web pages (web crawling), usenet posts, mailing list archives, DNS and WHOIS records
Guessing email addresses (directory harvest attack)
Asking people for their emails for one purpose, such as jokes of the day, and selling the email addresses elsewhere
Getting access to people's address books (which Quechup utilized)
Scanning an infected computer for email addresses.

Are there any other techniques used? Are any of the techniques above now obsolete?

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