I'm very new to Spamassassin and from what I can see, whitelisting and blacklisting email addresses can be done from my Webmin control panel, but I'm just wondering if there's a way email users can control the Spamassassin whitelists and blacklists from email clients like Outlook and Thunderbird?

Does the spam folder in the email account play a role in how Spamassassin determines what is spam and what isn't (ie, if I move a legitimate email from the spam folder to the inbox, does that help Spamassassin to learn that email from that sender isn't spam and vice versa)?

1. No, users can't control from Outlook (unless with their own Antivirus/antispyware software) the Spamassassin's black/whitelists.
2. no

Ahh, okay. Thanks.