comcast's new email policy seems to work (Score 1)

Comcast recently implemented the following policy:

"In an effort to help reduce the amount of spam reaching Comcast.net email addresses, Comcast has implemented a new policy that will block email sent from an email server that has no rDNS entry."

http://forums.comcast.net/comcastsupport/board/mes sage?board.id=2&message.id=79035

Since they did this spam getting through to my home account has dropped by at least 90%, as has mail ending up in the "screened mail" folder for my comcast email address.