Fixed - Yahoo are no longer deferring mail forwarded from our US MX servers. (13:05 UTC — Oct 15)
Watching - Yahoo have begun to accept some mail forwarded from our US MX servers. We’ll continue to monitor. (20:34 UTC — Oct 14)
An abusive network was sending a very high volume of messages to a @yahoo.com forwarding address hosted on Opalstack’s US mail system. The high volume of mail has caused Yahoo to temporarily defer messages resulting in delayed delivery.
We’ve blocked the abusive network and expect that Yahoo will begin to accept the deferred messages over the next few hours as their systems register the overall message volume decrease. (17:54 UTC — Oct 14)