I'm working with them again, but in the mean time I've shut down all automated notifications for people using Yahoo/Rocketmail/Ymail addresses. If you want to receive notifications for pms again, please use a non-Yahoo address.
I've turned off all notifications from the server for Yahoo mail users. This includes mail notifications. After this problem is (hopefully) resolved, you'll need to reactivate that manually.
Umm... you do realize that this thread is a year old, yes? That said, please don't spam/necro unless necessary or if it's a topic that is easily brought back to life, etc. Thanks.