Topic: How can I use the Horde whitelist?

[cyrulution]

Spamassassin with level 2 is almost working perfectly with catching about 400 spams a day. 99% of spam and just a few "false positives" are caught. The false positives are most times from the same senders (some stores, my router and a few friends I cant persuade to switch off fancy designs).
For fine tuning I would just need to use the Horde whitelist to let these emails through. How can I do this?
I really do not need a sophisticated spam sorting system, just the whitelist for 99,99 % correct sorting.

Is there a simple way?

thanks
Cyrus