what is best free capture/Auto Responder for wordpress?

hi, guys
I want to bulit a Amazon products reviews site, and I want to built list on the site to Collect user list, and then I send to them the products Information. So I want to capture/auto responder. I have not money now, I want a free capture/Auto Responder, and it has not ads on it.
Do you know which is best free capture/Auto Responder, or low price?

I found "WP Autoresponder" it is free.
wpresponder
Now my problem is whether it can collect a list of users? How to set up it in wordpress?

I want you guys advices.
thanks

bro.


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