You can control the speed of bulk emails, from 1-10 emails per minute.
There is a limit to the total number of emails you may send, this is dependent on your hosting plan.
You can control the FROM and REPLY addresses separately.
You can monitor the job as it sends the emails, and you can cancel it half way if needed, and see who and who did not receive the email.
You can get stats on who definitely read the email, and who definitely clicked the unsubscribe link. But there will be others who did read the email who did not support our stats gathering method.
You cannot currently get any stats on which links they clicked, although you can get general stats in the web statistics area. We hope to increase the statistical reporting as time continues.