emails all pendding and could not sent out

I found that from the Email Activities screen, all emails not pendding and not sent out. I already setup cron job in my CentOS 6 via Cpanel using command below where mysite.com is just example here:
curl --user-agent -O "http://mysite.com/index.php?option=com_easydiscuss&task=cron"; >/dev/null

I run the command manually from linux too, but emails still not sent out"
http://screencast.com/t/tlIYs2gGjiK