Hello. 

I install Open project in a .local address and use a reverse proxy to access from outside the network.
All is working fine except the links in the mails.

There is no place to change the url in the mail. 

For example:

To change the password:

But the correct link should be:

How can i change the address if open project is installed behind a reverse proxy?

Thanks in advance.

Dear Joan Albert

I installed OpenProject behind a reverse proxy and I do not have these issues

lets split your issues into two

1. HTTP vs HTTPS
   you must run OpenProject on https too, not only the reverse proxy, most likely at the moment your OpenProject is installed for not using ssl. please issue command on terminal: sudo openproject reconfigure, you will have to have your certificates ready
2. local top level domain
   please look into your /etc/hosts file and issue the command in terminal hostname 
   most likely you configured your Linux Server incorrectly, read here about changing your hostname in Ubuntu:
   https://learnubuntu.com/change-hostname/
   Here you find how to correctly setup your hostname in the GUI, can be also done at point 1. already: https://www.openproject.org/docs/system-admin-guide/system-settings/general-settings/

I hope you get inspiration by what I wrote and you will have a successful solution.

Kind regards

Adam