edX-platform - Change site name used in account activation email

The default configuration for SITE_NAME used in account activation email of edx-platform can be change by modify the following file:

# nano /edx/app/edxapp/lms.env.json

...
"SITE_NAME": "your.custom.domain",
...


Restart the LMS/CMS service:

# /edx/bin/supervisorctl -c /edx/etc/supervisord.conf restart edxapp:
# /edx/bin/supervisorctl -c /edx/etc/supervisord.conf restart edxapp_worker: