mkdhparams — Create new DH parameters for the Courier Mail Server
/usr/lib/courier/sbin/mkdhparams
This script is intended to be executed from a cron job, monthly.
If the file /etc/courier/dhparams.pem is older than
25 days, the script creates a new file. This file contains pregenerated
DH parameters for the Courier Mail Server.
The DH_BITS environment variable, if set controls the
length of the generated DH parameters. It gets passed, verbatim, to
either the dhparam OpenSSL command, or the
--sec-param option to GnuTLS's
certtool. The default value is 768 for OpenSSL,
and “high” for GnuTLS.