I managed to set-up a project and enable automation that every time an email is sent to a specific email address it creates automatically a task in the Asana Project.
The problem is that all members of the group receive the following error message:
This is an expected behaviour. In order to create a task in Asana, the sender email must be a members of your Organisation. I’d recommend setting a rule in your email so that every time you receive an email from a specific sender, this email gets forwarded to Asana. This way, the email sent to Asana will come from your email address, which Asana will recognise, and your task will be created!
This rule must be set your email inbox, so unfortunately I can’t help with that, but I’d recommend searching help centers from your email provider. Here are some resources for Gmail and Outlook for example.