Welcome mail when adding new user isn't using the correct domain name to change password

[Enumerating]

Hello,

I'm running I'm on DSM 7.2 (DSM 7.2.1-69057 Update 5).

When adding a new user, I let him the choice to change the password.
When the user is receiving the welcome email with the link to change the password, the link is for the local network only (see screenshots please).

I am not using QuickConnect nor DDNS.
I have a domain name pointing to a FIXED IP ADDRESS: everything works perfectly.

I tried to add %HTTP_URL% and %URL% in the events templates to try and to see if the problem is different, but it's not.
You can see it on all my screenshots.
Is there something else to enter? A hidden parameter? I don't think so.

Thanks for you time.