I am the owner of a relatively large group; 200+ messages a day, 10k members.
About 3:30 CST this afternoon, individual members that receive emails in my group stopped receiving messages. The messagesare still being posted to the group repository.
Groups.io got blacklisted overnight (for me) - something like 11pm-4am UTC - I found this by going to my account (dropdown top right) and looking at my own bounces.
