I moved my autoresponder system moved to a new host. It is almost working ok, for example, you can manually subscribe people, they can sign via a form, all the test messages are ok.
It should however be possible for someone to send an email and be signed up for that autoresponder message.
This part does not work - although it did work when it was with the previous host.
I am sure this is a simple problem but I am unable to fix it myself.