Yes. There is a batch program available for download called TSMADump.

The features of the program are as follows:

Easily export a list of all the users, aliases, domains, or domain aliases on a Smartermail server.

Output to a text file for processing in a batch file or importing into a spreadsheet or database.

Can be run directly on the Smartermail server or on any Windows machine that can access the server's webmail homepage.

Uses Smartermail's documented and reliable Web Services interface rather than scraping HTML or XML files.