Your biggest problem here is the URIBL_WS_SURBL hit. This scores 4.0 and
puts you over the limit.

What this means is that a domain mentioned in the email was on this list:

http://www.stearns.org/sa-blacklist/sa-blacklist.current.domains

This means that you would be having problems with more ISPs than just us.

If you wish to have yourselves removed, see this link:

http://www.stearns.org/sa-blacklist/README.submissions.html

Dan.