[MM3-users] Stopped getting my own messages to a list

I recently stopped getting my own messages when posting to one of the lists. I get my own mail when posting to other lists. Receive own postings is set to Yes. I'm a non-member on the list I'm posting to, but that list has another list as a member, and I'm a member of that list, with Receive my own post set to yes. I've not configured these lists for a long time, and it has worked until recently. Any idea on where to search for the cause?

I've changed dmarc policy on the domain from none to quarantine. Should that matter?

Lars