I have setup an email, let's assume: s@yyy.com

I have enabled all of the following:

in the Control Panel.

I have also enabled email forwarding to 3 other emails, lets assume them to be: a@yyy.com, b@yyy.com, c@yyy.com . (these emails are hosted by another hosting service)

Now when I am sending an email to s@yyy.com , theoretically it should forward the email to other three emails, but in fact the s@yyy.com did not receive any email at all (because it is not shown in the inbox of that email). I did not even receive any email sending failure then what happened to the email which I have sent?? I believe that my mail forwarding and server is not setup properly.

Can someone help me with this setup issue?