Mail unjustly marked as SPAM because of PBL database

There is your issue. You should not try Directadmin to remove things from spamassassin as the things you mention are just part of the fact that it works and stops spam.
Directadmin is not ment to be used in a home environment to begin with.

Next to that, Spamhaus is not the only one which puts dynamic ip's on a default blacklist. Many big providers like UPC, KPN and Ziggo in the Netherlands for example do this also by default, to prevent their users from being able from sending spam. Because in the past this caused their ip's being blacklisted in spamlists, causing all their customers not to be able to send mail anymore.
Also, many mailservers are set up that they don't accept mail from dynamic ip adresses, so even if you could find a way around, a lot of your mail would be blocked before it could reach the recipient.

So if you want to have your own mailserver at home, the solution is to have your mailserver send outgoing mail through the smtp server of your provider.
In that case your problem of the blacklist is gone.
Maybe you should read a bit about mailservers and RFC's.

Anyway, your solution is not to change things to Spamassassin but to use your ISP's smtp server as mailrelay for your mailserver.

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