After following the instructions for moving domain and activation Gmail, things seem to work. I added alias for the groups rather, rather than recipient maps. It works, but for some reason sending an email to the styrelse.wikimedia address, the reply goes to the member group, not the list.

Tried with recipient map instead of alias, but that yielded the same result.

In T316751#8202176, @Sebastian_Berlin-WMSE wrote:

After following the instructions for moving domain and activation Gmail, things seem to work. I added alias for the groups rather, rather than recipient maps. It works, but for some reason sending an email to the styrelse.wikimedia address, the reply goes to the member group, not the list.

This was not related to the subdomain. Please see T195596#8213222