26 Mar 12 4:01 pm
First of all, yes, using a list of people that did not optin to your list is spamming.
When you import the list into Aweber, it will not actually add them to your list right away, but will send them each an email asking them if they want to optin. So if you added them and they opted in, then that would be a legal list, however, how many of them will actually optin is something that no one knows, and I would guess that not very many if any at all.
Also, if Aweber knows that you are importing a list that is not yours, they'll probably terminate your account, check their TOS.