My account was compromised and they were sending out up to ******* (one million) emails per hour on my expense. Fortunately my bank cut the account and nothing was lost. After repeated emails about this all you get is "Our Technical Team is Looking into it"! Had this several times and I assume the place is ran by dorks.
After this we actually reviewed sending out emails and found that on a sample of 500 emails sent only about 32 where getting through. Most bounced, classed as spam or just simply blocked at the other end. Personally I wouldn't bother with a mailing list as people get "list boredom".
In a word... don't bother