$ veldfire -h
will give you all of the command line options.
usage: veldfire [options] [files to attach]
-f FROM From address
-t TO To address, or addresses separated by one of: ,:;\t\n
or file containing one address per line
-s SUBJECT Subject of the email
-H HEADER Add custom header field (multiple values possible)
-m HOST Mail host (default localhost)
-p PORT Port on mail host (default 25)
-l LOGFILE Log File (default /var/log/veldfire.log)
-e LOGLEVEL Log Level (1-6) (default 3)
-c CONFIGFILE Config file (default /etc/veldfire/veldfire.conf)
-n SECTION Section in config file (default veldfire)
-r REPORT Email address to send a report to
-o MAXCONNECTION Maximum number of emails in one connection (default 128)
-y SENDTIMEOUT Timeout for sending data
-z RECVTIMEOUT Timeout for reading data
-x No message (don't wait for a msg on stdin)
-g Foreground (don't fork to the background)
-i Log to stdout as well as to the log file
-h Help
-v Version
Email format: J Smith <j@smith.com> | j@smith.com | <j@smith.com> Messages are read from stdin, and can be already formatted multi-part messages