Sender to List Always Marked as Spam

I recently created a new mailing list, and one person's
messages are  
always tagged as spam. However, I also correspond directly
with this  
same person, and her messages sent directly to me are never
marked as  
spam.

Same sender from the same account; sent to the list address,
it's  
spam, but sent to my email address, it's not spam.

How can I convince SurgeMail that this person's messages to
the list  
aren't spam?

Why are messages sent directly to me not tagged as spam, but
messages  
to the list are?

Here's a sample SpamDetect header: X-SpamDetect: *******:
7.900000  
ImageSize=3.0,SPF Default Fail=2.5,High tags-to-text
ratio=1.8,X- 
Verify-SMTP present=0.6

Any help and/or insight will be greatly appreciated!

John

-- 
John Wilkes
johnwilkes.com

He doesn't believe in spreading liberty with guns.
Ron Paul for President   -  www.ronpaul2008.com