user in whitelist but not

I just received an email from  [email protected]
with  -100 USER_IN_WHITELIST

But I do not have an awl and my whitelist does not have this person in it.

How can this be?

X-Spam-Score -86.4 (---------------------------------------------------)

Spam detection software, running on the system 
"hosting.wecanhost4u.com", has    identified this incoming email as 
possible spam.  The original message    has been attached to this so you 
can view it (if it isn't spam) or label    similar future email.  If you 
have any questions, see    postmaster for details.    Content preview:  
[...]     Content analysis details:   (-86.4 points, 5.6 required)    
pts rule name              description    ---- ---------------------- 
--------------------------------------------------    -100 
USER_IN_WHITELIST      From: address is in the user's white-list   
3.5 BAYES_99               BODY: Bayesian spam probability is 99 to 
100%    [score: 0.9926]   
0.0 FH_HOST_EQ_VERIZON_P   Host is pool-.+verizon.net   
2.6 FH_HELO_EQ_D_D_D_D     Helo is d-d-d-d   
2.6 HELO_DYNAMIC_IPADDR    Relay HELO'd using suspicious hostname (IP 
addr    1)    3.0 BOTNET                 Relay might be a spambot or 
virusbot    
[botnet0.7,ip=68.238.67.203,hostname=pool-68-238-67-203.lax.dsl-w.verizon.net,maildomain=hookedonmicrosoft.com,baddns,client,ipinhostname,clientwords]    
1.8 BOTNET_IPINHOSTNAME    Hostname contains its own IP address    
[botnet_ipinhosntame,ip=68.238.67.203,rdns=pool-68-238-67-203.lax.dsl-w.verizon.net]    
0.1 RDNS_DYNAMIC           Delivered to trusted network by host with    
dynamic-looking rDNS