We also now have a dedicated page for our Newsletter Service which we hope everyone finds to be an attractive alternative to the big names or having to host and manage your own.
Yes you can use @joeworkman PostOffice Stack with the newsletter service.
Yes you can build a list and create/send a newsletter to the list. What do you mean by “process responses”? Yes, the service automatically handles bounces and unsubscribes for you. It also features double opt-in support so users have to confirm their subscription (for GDPR).
Additionally, what do you mean by “filtering”?
I see your plans have unlimited email ACCOUNTS, but I assume the total of all of the accounts must then be below the total GB for each plan? Is there a way to buy more SPACE or do you recommend adding the Chilimail in that situation?