Add DEFAULT_FROM_EMAIL in your .env file (version < 1.26.0)
This intervention is needed when upgrading from a version lower than v1.26.0
Emails sent by Codabench (sign-up confirmation, password reset, notifications, etc.) now use DEFAULT_FROM_EMAIL as sender address, instead of SERVER_EMAIL. Before starting the service, add DEFAULT_FROM_EMAIL to your .env file, with the address you had in SERVER_EMAIL:
You can keep SERVER_EMAIL: it is still used as sender address of the error emails sent by Django. If DEFAULT_FROM_EMAIL is not set, emails are sent from Codabench <noreply@codabench.org>, which your email server may refuse.
More information here