I am trying to switch from Thunderbird to Mail on the Mac. Everything seems to work correctly except ...

I am having problems defining Trash as the Trash folder on the Tuffmail server. I have a Tuffmail folder under Trash at the top of the screen but items in that folder do not show up on the server Trash folder.

Can anyone help?

Also, I know how to setup aliases for Tuffmail on my iPad, but how do I do it on the Mac?