Goodmail has just informed us that as of Monday, February 1st, how Yahoo will handle Goodmail CertifiedEmail messages delivered to Yahoo recipients will changes. Previously, Goodmail-certified messages were guaranteed inbox delivery with images and links enabled. Goodmail-certified messages will continue to be delivered, but inbox vs bulk folder delivery may vary based on unknown factors. I assume that the reputation of the sender is the primary factor there, but that is a guess on my part.
Goodmail has indicated to us that they are in discussions with Yahoo regarding the future of CertifiedEmail messages as it relates to delivery and disposition of those messages into Yahoo mailboxes.
Goodmail is currently notifying all CertifiedEmail-using clients of this change and has indicated that they will notify of any future changes.
As we learn more, we'll be sure to keep you updated.