The ossec-maild program sends alerts via email. It is started by ossec-control.

-c <config> Run using <config> as the configuration file.
Default value /var/ossec/etc/ossec.conf
-D <dir> Chroot to <dir>
Default value /var/ossec
-d Run in debug mode. This option may be repeated to increase the verbosity of the debug messages.
-f Run in the foreground.
-g <group> Run as a specific group.
-h Display the help message.
-t Test configuration.
-u <user> Run as a specific user.
Default value ossecm
-V Display the version and license information