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."
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.
"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.