uhhh....the title says it all-.-
You will need to contact Microsoft and the Developers for Halo 4 for them to resend that email to you again
this link above, will take you to their forums, in whick you can contact their support
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No need to contact anyone,all specializations have been unlocked for everyone to earn. You need to download the 2nd piece of Sparton Ops dlc i think, which is free.