locked Yahoo delays
Around 3am pacific this morning, Yahoo Mail started deferring email from us. According to their website, the deferral should last around 4 hours, and indeed it does look like they're starting to accept email from us again. No messages should be lost, just delayed.
I have no insight into why they did this. But I have just turned on FBL processing again for the yahoo.com, att.net and sbcglobal.net domains (in addition to the already resumed aol.com).