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[DBMail] is an IMAP server that uses an SQL database backend to store the emails. It's possible to improve the IMAP server performance by optimizing the SQL server.
=== MySQL ===
Compile MySQL 5.0.x with LinuxThread if you are using FreeBSD 4.x or 5.x, since that will make it works faster.
Also check these links:
* [Optimizing the MySQL Server] (Especially the section on how to turn on the query cache.)
* [InnoDB Performance Tuning Tips]
=== Known bugs ===
Server-side sorting is broken in DBMail 2.0.7. Don't use server-side sorting if you get the following error:
<code>
ERROR : Connection dropped by imap-server.
Query: SORT (FROM) ISO-8859-1 ALL
</code>
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