User docs

User contributed DBMail documentation and examples

• Database Setup for PostgreSQL, MySQL, SQLite and Oracle
• MySQL Notes
• Configure your MTA
• DBMail with Exim
• Using DBMail with Postfix
• Setup dbmail with Sendmail
• Setup DBMail with qmail
• Manage DBMail users
• Manage users with SQL
• Shared Mailboxes with DBMail
• Managing email with DBMail and Sieve
• Shared Mailboxes with DBMail
• Logging in DBMail
• Semantics of DBMail Folder Permissions
• Using imapsync to transfer from cyrus to dbmail