I have thousands of customers ( email address ) and their name and what they have purchased from business!
I need a VERY powerful software, that can email newsletter to all
1) I can stop the emails, when need. able to continue the emails.
2) Customer can reply to remove from our service!
3) When customer reply to remove, it will delete customers from list.
4) Will verify which emails has been sent. Which email is not exit. And easy to pick it to remove it.
5) Able to import from my Microsoft file or Access file.
6) Able to use smpt account