Email forwarding not working

I have a website aaa.com

i have created additional domain bbb.com pointing to the same directory. I did not create an alisas because i could not find how to create an email for it.

address@aaa.com forwarding assignment is ok
but on address@bbb.com i get following error: ‘NoneType’ object has no attribute ‘domain’
https://i.imgur.com/LLqulLH.png

what am i doing wrong?

Did you ever get this resolved?