Visual Mail also supports the use of POP3 mailboxes. To set one up, specify the mailbox name as user@host. When it is first accessed, you will be prompted for the password.
To change the system mailbox that Visual Mail uses or to add additional incoming mailboxes, use the Change Other Options entry under the Other... menu. Edit the field labelled Incoming mailboxes and save your changes once you are finished. Additional mailboxes can be added to this field by separating them with a space character. Each mailbox will have a separate button added at the top of the main screen with the mailbox name as a label. You will have to restart Visual Mail to have this change take effect.
Once the startup options are saved in Visual Mail, it will save the name of the system mailbox file(s) and will no longer use the MAIL environment variable.