modifying choplist?

Hi all. I'm currently running a mailing list with over 12,000 subscribers on Smartlist. Many of my subs have hotmail and yahoo addresses. The way choplist works right now, I believe it hacks the list up by domain name and sends it out. Trouble is, yahoo will only allow so many emails before it refuses the rest as "too many recipients". (I'm not even sure how many are allowed before it denies the rest...)

My question is, is there a way to modify choplist to get around this problem? And if so, how? Our mailing list is only going to get bigger...

Please keep in mind that although I am computer literate when it comes to HTML, I am new to mailing list management and need any explanations in laypersons' terms. :)

Thanks a bunch!

Autumn Williams