To make sure email filets (your friends' mail or newsletters, for example) isn't thrown away by SpamButcher, you can whitelist known senders. I have whitelisted the whole "about.com" domain, for example, so I can be sure the About newsletters I have subscribed to always get through.
To make sure SpamButcher doesn't slaughter mail from known senders:
- Click the Configure button in SpamButcher.
- Go to the Known Senders tab.
- Click Add under Known Good Senders and Recipients.
- Type the email address or domain you want to whitelist.
- To whitelist a domain, simply use the domain name.
- For whitelisting all About newsletters, for example, type "about.com".
- Click OK.
- Click OK again.

