Can not send email via Hostgator

First, Mail system work find in other host but after I move all to Hostgator then Email cannot be send.
I've been try to check these :

1. Check PHP config php.ini field sendmail_path = /usr/sbin/sendmail -t -i;
by go to Hostgator CPanel, find 'advance' box, select 'PHP Configuration', go to 'Edit custom php.ini', and looking for 'sendmail_path' field. I'm not edit any field but only check that 'sendmail_path' is correct like the suggestion from http://forum.opencart.com/viewtopic.php?f=88&t=139862
2. In Admin config I use Mail protocol as 'Mail' and use Mail parameters as :
-F mail@myhost.com

then try to checkout new order but there's still not work at all.

I use OpenCart Version 2.0.2.0,
Are there any way to check or solve the problem ?

Hi Bon, have you checked the thread below yet?

http://forum.opencart.com/viewtopic.php?f=181&t=142221

There's no space after -f Otherwise you can try SMTP