Hello just wanted to say I have recently picked up GuildSpam. Which has not been updated in about 2 years. I have since updated the addon to work with LK. As well as other fixes and added Death Knights to the class drop down. In the future I will modify this further, and add more things. In all hope you like it =).
And yes with all the coming changes and including ones I did to get it going for LK. I have renamed it Guild Mailbox.