[Login page that writes email address to a database]

Hi all,

i need a little assistance, i have a public free wifi area and i would like the users of it to give me an email that then grants them access, the idea is to log the emails addresses to a database for marketing use.

 

Can anybody tell me if there is an off the shelf solution i can buy, i have the server and domain along with the mysql server.

 

thanks

stuart