How to open ports... when 'enable nat mapping protocol' is already checked:

i read on these boards that checking 'enable nat mapping protocol' is the way to have apps that need certain ports open automatically open them (i'm paraphrasing). in airport utility, this option is checked, yet ports 993 and 25 are still closed when i need them to be open.
thoughts?
thanks.

thanks - but i'm pretty much lost after step 2!
host device? mac address? appropriate UDP port value?
way over my head.
is there a simpler solution?
thanks!!

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