[Exim] SpamAssassin

Wooo,

did anyone see something high like this before??

2003-03-19 08:32:13 H=adsl-63-205-156-74.dsl.lsan03.pacbell.net (yahoo.com)
[63.205.156.74] Warning: reverse host lookup failed
2003-03-19 08:32:17 18vY3b-0003VD-0c rejected by exiscan(): This message
scored 50.7 (+++++++++++++++++++++++++++++++++++++++++) spam points.

What's happening here? Has SpamAssassin 2.50 a new ruleset??

Michael