Issues with Mailing Lists utilizing an Access database

When using a mailing list that queries its members from an Access database, the 'Test query' seems to work properly - but when I send a message to the list the member list is not pulled properly. What's wrong?

The only known issue for this to occur is if the database, table, or column names include a space in them. MDaemon's ODBC connector does not support database, table or column names with a space in them. If you rename your database, table and/or columns (and then recreate the query) this should work properly.