MDR Silently Fails if default folders do not exist

[Jason]

1. Installed Haiku Alpha 1.
2. Setup MDR
3. Default Mail folders (inbox and out) did not exist under ~/Mail
4. MDR would not send email without said folders
5. MDR displayed error message for ~/Mail/inbox not existing
6. MDR did not display error message for ~/Mail/out existing
7. Mail would not send without ~/Mail/out folder
8. Outbox mail would be created in ~/

MDR should make any folders that exist in its configuration if the folders do not in fact exist.

MDR should give an error message if the OUTBOX folder doesn't exist.

MDR should NOT put mail files in OTHER folders if the folders in the configuration do not exist.

WORKAROUND: Create 'inbox' and 'out' in ~/Mail if they are not created upon Alpha 1 install.