I have an openproject server internal to our LAN.. but from time to time I want to be able to invite people from outside our network. 

I have a nginx reverse proxy in place to allow connections to the server itself, but of course it is a different URL.

Is there a way to set the invite URL - at least the base server? 

Right now I set the new user's email to mine, copy the activation email change the scheme/server and send it out, then go into the new profile and change the email address

Thanks