[Spambayes] spammers abusing the yahoo redirector.

[Tim Peters]

[Anthony Baxter]
> At work, we're seeing a whole pile of URLs in spam of the form
>
http://rd.yahoo.com/hbillgbyijbd/*http://www.naturalgrowthmeds.com/rmvefwfew
jlk/
>
> This is (ab)using the rd.yahoo.com redirector to attempt to foil
> the filters.

Several redirectors are commonly used in spam.

> We should probably put a simple rule in to fix this.

Sorry, I'm not following:  what's broken?  The URL above generates this set
of features now:

'url:*http'
'url:com'
'url:hbillgbyijbd'
'url:naturalgrowthmeds'
'url:rd'
'url:rmvefwfewjlk'
'url:www'
'url:yahoo'

so we're not missing any of it.