intalacion in subdominion

Hi, I have the www.hospitalveterinariosinai.com and there I have installed one type of template "vacations" and works great. Now, I intalled a VM in a subdomain www.petshop.hospitalveterinariosinai.com , everithing works great too, but.

I change the configuration in the "virtuemart.cfg" to avoid the error that usually appears "8080". But when a new user register, this is not added to users in the VM PANEL and could complete the buy.

I create a new database in my cpanel for this template and subdomain, if i register a user manually it works... but if they register from the web, theres no the mail activation in his mail and cant complete the operation.

if somebody know hoy to fix this problem i appreciatte too much.
greetings

You should contact your hosting provider to check if email application (phpmail or sendmail) is installed on your server and if it's properly configured in your Joomla Global Configuration.