Yahoo and their mail filters..

[johnl at iecc.com (John R. Levine)]

> This also pre-dates organized crime becoming heavily involved, and pre-dates 
> the obsession with browser exploits.  Back then a lot of spam was sent by 
> semi-legitimate marketers from the US.  These days all the bad guys are out 
> to get you to click on a single link.

Right.  Back in the 90s spammers were trying to build their lists, and 
used fake opt outs to do so.  These days through a combination of web 
scraping and dictionary attacks, they have more addresses than they know 
what to do with.

My advice to people these days is to unsub if a message is from someone 
you've corresponded with before, or if it looks like someone who is legit 
but clueless.  Then hit the spam button.

Regards,
John Levine, johnl at iecc.com, Primary Perpetrator of "The Internet for Dummies",
Information Superhighwayman wanna-be, http://www.johnlevine.com, ex-Mayor
"More Wiener schnitzel, please", said Tom, revealingly.