PostgreSQL, version 8.2 or higher.

An already configured Mail Submission Agent (MSA)^[1] or better, a Mail Transfer Agent (MTA)^[2] able to send outgoing mail by way of a local command. Popular MTAs are postfix, sendmail, or exim.

To build the user interface from source, the Qt library (version 4.5 at least) for Unix/X11 or MS-Windows and the PostgreSQL client library (libpq) are needed. All popular Linux distributions provide these libraries in pre-compiled form.