Newsgroups (aka Usenet) are an important source of active email addresses
for spammers. Harvesting Software scans all groups and grabs the addresses
of posters. If you post a message on a newsgroup using your real address,
you can be sure that you will get spam.
Spammers also use software to search the web for email addresses posted on
websites. If you post your email address in plain text on your website, it
is only a matter of time before this software finds it.
You can look up "HARVESTING SOFTWARE" on Google:
"Our country puts $1 billion a year up to help feed the hungry. And we're by
far the most generous nation in the world when it comes to that, and I'm
proud to report that. This isn't a contest of who's the most generous. I'm
just telling you as an aside. We're generous. We shouldn't be bragging about
it. But we are. We're very generous."
- Washinton D.C., July 16, 2003