Hi @anon21756750,
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!
If you’re curious, you can also check out this other thread on the same topic: Automatic forwarding to ASANA from Google groups account for creating tasks. this topic is also covered in article from our guide.
Hope this helps!