SORBS has been a good resource, generally, more recently. It has had a lot of problems I don't deny. And, because of the problem I noticed yesterday, I modified things and added that new advisory section to the GUIDE psot.
My guide isn't a fool proof solution sent by the Lord above. It went over a month before SORBS started causing any user on my server an issue, and it just so happened to have been me.
Again, if someone feels there's a problem with mail delivery or hears of such problems and sees SORBS in the rejection email sent to the sender of said email, I would look at the Tips and Tricks section and modify accordingly.
ISPC3 on Debian! It's great!