Mysterious usenet spam

From: mike3 (mike4ty4_at_yahoo.com)
Date: 04/29/04 

Date: 28 Apr 2004 22:16:37 -0700

I found this spam:

"Rpefm ybhk fqe whsf rm laps jf oklaesr mmef oeump?

Ykrhgs ttwerl yews lzb sqf xoa lmj
llere flr xrev dkbzn pebae mmhb cnyts
mvlrvm nyspr fuekc lmpwfx tlsnyof roylf eeyf y bum glffhel iifl? <rest
snipped>"

Is this some sort of cryptogram or jsut random gibberish? I haven't
been able to crack it. Lots of messages like this seem to exist. Is
there some sort of secret code that's used by lots of people that I
don't know about?