When someone signs up for my free newsletter on my site, they are added to my aweber account list. However, I would like a modification, which means that they will be added to 2 separate accounts at the same time. (I have 2 separate aweber accounts). Please note, on Aweber I have single optin on both my accounts, therefore I still only want single optin for both accounts when you do the modification. Please do not bid if your implementation requires double optin (since I already have that).
So to clarify, when a person joins one list, he is automatically added to another list (which is on a different Aweber account), as single optin (no email confirmation required).