If any of you play Diablo II on the realms anymore, this is a good way to stop the spammers, by permanently ignoring them.
In 1.13d there is a new document in your D2 folder called ignore list.
Open it up with notepad. It probably already has a list of users that Blizzard has deemed spammers.
Make sure that in game, you have enabled /ignorepersist.
Keep your ignore list document up to date by adding any new spammers to the list.
This was included in the patch notes for 1.13d, but I doubt many users realized this.