It seems Yahoo and AOL email servers have decided to refuse all messages from this tor-relays list. Other lists aren't affected, yet.
We're seeing this message from Yahoo and AOL servers:
"Status: 5.2.1 Remote-MTA: dns; mailin-04.mx.aol.com Diagnostic-Code: smtp; 521 5.2.1 : (DMARC) This message failed DMARC Evaluation and is being refused due to provided DMARC Policy"
There is no fix for this yet as it breaks mailing list software globally. This bug explains the situation, https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=752084
If you use yahoo or aol for email, unfortunately you can't join nor receive email from our lists.
I suspect this will become true for all of our email lists soon.