I finally did it... disabled tells with busy status. RMT unbearably bad.

[Purrfectstorm]

If your list is full I guarantee you can delete the first 190 right now and you won't hear from a single one of them. The spam accounts are only used for a few days before they are baned or abandoned. Your list is full of people that don't exist anymore. Flush it out. I have at most 5 people on mine right now because I go through every few weeks and flush out the list. No ill effects at all. Been doing this for over a year now.

So why even blacklist them then?