Bypass email spam policy for 1 email address

Hi,

I am using Email spam policy 'Suspected Spam: Modify subject line with "[Suspected Spam]" (default)'. Problem I am having is that 1 mail is being held as Spam though the email address is genuine. I have whitelisted the email address, but it is still being held. How can I bypass the email spam policy for the specific email address?

Thanks to help!