[MlMt] Muting - not working as documented

[John Purnell]

When I mute a message from a mailing list, I see in the Activity Viewer 
that the `$Muted` flag is applied to the message. I then delete the 
message and can see it is moved to the Trash mailbox. But subsequent 
messages in the thread are still filtered (by the server) into the 
mailbox of that mailing list, are not marked read and are not moved to 
the Trash mailbox. I expect further messages in the thread (not 
addressed to me) to have the `$Muted` flag set, be marked read and be 
filed into the mailbox of the parent message (in this case Trash).

Am I misunderstanding how this works, or what do I need to do to make it 
work as described?

Thanks
John