Apparently, Yahoo laid off their email abuse staff, because the company now responds to forwarded email with full headers to email@example.com with a notice that “abuse reports are only accepted in Mail Abuse Reporting Format.” Someone on the Internet actually tried to make a script that would format email messages into the correct format, following the guidelines in the RFC for MARF, and all attempts were rejected by Yahoo’s servers.
In other words, Yahoo no longer accepts reports of email abuse. Notably, I have seen a sharp uptick in the amount of spam reaching my spam folder from @yahoo.com addresses, and now there is no way to report such abuse. It may be time to blacklist all yahoo.com email and whitelist addresses I know are good. Word in my shop is that Yahoo has been self-destructing for a while now and this is probably just the latest incarnation of the hellfire that Yahoo will become if it remains on the current path.
Where is the leadership?