Many mailing lists obscure users' email addresses in their archives. I'm nelson@xxxxxxxxxx in a lot of archives. The theory is this protects users from spammers. This is dumb. Spammers already have my address. All this mangling succeeds in doing is makes it harder for legitimate people to find me.
Email addresses are not secrets.
Update 2004-02-18: Thanks to Justin for CDT's report claiming that most spam comes from scraped email addresses. So maybe obscuring is useful afterall?