The next big step for fixing spam issues is to build a robust header_check and body_check file for Postfix.
As you see above, I have started on the header_check.
I'd like to determine how to setup a SUBJECT filter that would delete any email with more than 7 words. I have had NO legitimate email with more than 6 words in the subject. However, a lot of spam has between 7 and 12 words in the SUBJECT line.
I'm not finding great details on how it works, so it's going to take a lot of time. If you have any of your own mod's please post them so I can compile a better post above.
Also, filtering out all languages you DO NOT use would be sufficient. I will be filtering out all languages except ENGLISH, SPANISH, FRENCH, GERMAN, CZECH, POLISH, and PORTUGUESE when I have time.
ISPC3 on Debian! It's great!