[Users] execute?

[Bruce Bowler]

My latest 'issue' (remember, I'm trying to switch from sylpheed)

Execute doesn't seem to work...  I have unchecked 'execute immediately'
option.  I then delete a message, which places a 'red x' in the status
column.  At that point, I hit the execute button and expect that
pending actions would be executed (at least that's the way sylpheed
works), but nothing happens.  

Are my expectations wrong?  Is there a different option that I need to
check/un-check?  Something else?

Bruce