Exchange letting spoofed emails through

I am running Exchange 2010 and we have a SPF record set including the exchange server's IP address. We are still getting spoofed incoming email and the header shows the following:

X-MS-Exchange-Organization-Antispam-Report: SenderOnRecipientSafeSendersList
X-MS-Exchange-Organization-SCL: -1
 
I have the SenderID enabled

Why does Exchange think this spoofed user is on the safe sender list when his originating IP does match our IP?
kesslerkareAsked:
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systechadminConsultantCommented:
Did u checked the safe sender list on Exchange?
kesslerkareAuthor Commented:
The safe sender list is empty. The other thing is that the spoofed email user is a local user email address, meaning the incoming email shows as coming from an internal user on the local domain. Do I need to enable the SenderId for Internal to catch this?
systechadminConsultantCommented:
check the settings on the receive connectors, this might be lying there.

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