strange email spam site in yahoo redirecton?

[helenp]

Supose off topic, anyway
Actually only saying this though so strange spammer sends e-mails with rd.yahoo.com in url lately... checked the sites in url and are not included in yahoo.

Donīt understand why use url rd.yahoo instead of normal url.
Like this:
>>>>http://rd.yahoo.com/M=993895.6300073.3528779.
0486879/D=yahoo_top/S=6373439:LCC/A=8449759/R=0/
*http://www.nameofsite.biz/m/index.php?AFF_ID=m0323>>>>

Of course, didnīt click on it.
when you pass mouse over sites in yahoo search the links are rds.yahoo.com and not rd.yahoo.com