I subscribed to one which is a professional company outfit, it is about $0.10 per email send. Theirs are not spamming and they utilize online checking where you can login to check the status.
can you provide the company's name? would like to try it out but all that i've seen asked for a monthly membership.
do you mean emails are sent out? the script confirms what which email was the mail sent to and to which it wasnt
normally i take 1$ for every 200 emails but ill reduce to 0.70$ if you order more than 2000 or if you take my services regularly.