Double Optin Registrations

Hi there,

I love this theme but have one question about the registration process:

Can I make the User Registrations on Memberships a double optin registration so they show up within my e-mail lists? I would like to inform my subscribers about news and new offers but therefore use external sending technology. I would like to have each member registered with their IP and timestamp and be automatically inserted within the integrated mailing list, without having them to signup up for the Newsletter seperately.

How can I do that?

Thx for your help.