You could have downloaded Apple Mail Server 10.3 for Mac from our software library for free. The application is included in System Tools.
From the developer:
The Mail Server Update delivers overall improved reliability and is recommended for all systems running mail services on Mac OS X Server version 10.3.9. It includes improvements for: - more accurate reconstruction of mail database files
You may want to check out more Mac applications, such as MailServe for Lion, MailServe for Leopard or Mail Import, which might be related to Apple Mail Server.
E-mail Tools
E-mail Tools