Double opt-in for email newsletter

I don’t believe cs cart has a double opt in feature currently, is there an addon or way around this to have one implemented? I am being required to have my sites sign up for the newsletter be double opt-in, but I do not have the php programming knowledge to modify cs cart to do so.

Does anyone have any solutions or answers to getting it to be a double opt-in system.

I think this would be a good idea to have in CS as standard - or maybe an option.