That doesn't mean the server doesn't send a raw, and they should be silenceable through /halt. After some discussion with a couple of other experienced mIRCers, some logic problems have arisen which might explain why 321 isn't haltable in the first place.
Being able to block 321 would also block the creation of the channels list window. However, 322 would still be received, so what should mIRC do with the information? The only reasonable solution to this would be to move the creation of the list window to raw 322, so if you /halt 322 it stops the list window being created. However, the problem with this is, if you did /list >1000 on a small network, or /list #channelname which is +s, no /list window would be created at all despite expecting one to be. Also, if you only want to receive the last channel to be listed you would be waiting ages, and then the window would be created after typing /list.
This doesn't explain why 323 can't be halted however, and I don't see why it shouldn't be if that's what people want to block the message appearing.
By the way, please don't worry about posting a bunch of possible solutions
We'll see what Khaled thinks in upcoming versions I guess!
Regards,
