Webmail not working with Multisite installation

Ok, managed to do it.

Solution was to create the config

/etc/nginx/sites-available/webmail.site.com

copy the data from

/etc/nginx/sites-available/webmail

then enabled the site by doing ln -s command in

/etc/nginx/sites-enabled/webmail.site.com

after all this do these commands

nginx -t
/etc/init.d/nginx stop
/etc/init.d/nginx start

Don't forget to chmod the rights to the config file