How can I know in advance what score SpamAssassin will assign to my email?
Some ISP's use SpamAssassin to filter their customer's email. In order to avoid their spam filters you should try and keep the SpamAssasin score as low as possible.
To find out the score that SpamAssassin will assign to your email, send that email to firstname.lastname@example.org
Shortly after sending the email, you will receive an email back with the results.