vCenter appliance 5 and SMTP Configuration

hi guys

I setup the

SMTP Server IP

and

Sender Account in my new and shiny vCenter Appliance 5 server

SMTP Server: 192.168.1.x

Sender account: vcenter@mycompany.net

now testing for the email alerts I get that my email server gets or receives email from the root account from my vCenter app lie this

root@servername.mycompany.net

so this is not valid and my email server won't relay this email

any idea if there is a issue for vCenter appliance since is linux having issues sending emails?

thanks a lot