Some E-Mail Variables don't work?

I set auto-response messages under

Setup/Configuration >>
Email (aMember Pro Configuration : E-Mail)


There is one of the variables I use that does not work.

{$product.title}


But {$user.name_f} works.


Now {$product.title} does work in my individual product's auto-responses.

So I'm thinking that {$product.title} does not work in the auto-response emails that are sent to all the subscribers?


Thank you,

Hiro

Thank you for the answer!