Try looking at reviews and the history for each site.
I need some help because I'm not very familiar with email ads I recently bought 1000 email ads, from taketheinternetback.com and paid $15 for that and I got about 450 visits from them in about one week. I did sell more ebooks (my online business), but I paid for 1000 emails and sincerely, was expecting to get at least 60-70%, so I'm not too keen about this program.
Do you know websites that provide better results?
I got to the website by searching for opt-in email advertising on google, I heard that 'opt-in' is necessary otherwise my emails will be considered spam.
Can someone help me or come with some new advices ?
Thanks and I'm waiting for your replies.