[typo] Spam checking

[Trejkaz]

My installation is getting a bit old so kick me if this was already fixed in 
the last release or so...

But I noticed my server machine spinning unusually hard last night and it 
turned out a guy was trying to flood me with trackback spam.  Lucky 
trackbacks were disabled so it didn't affect me, but I noticed that even 
though trackbacks are disabled, Typo was still going through the full spam 
check cycle rather than just outright rejecting the trackback.

Is that normal?

TX

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