It seems that the emails delivered by the Knowledge base using the always data email server is received mainly as spam.

Those are my email settings:

# REGISTRATION SETTINGS
ACCOUNT_ACTIVATION_DAYS=7
EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
EMAIL_USE_TLS = True
EMAIL_HOST = 'smtp-coopstarter.happy-dev.fr'
EMAIL_HOST_USER = 'coopstarter@happy-dev.fr'
EMAIL_HOST_PASSWORD = *********
EMAIL_PORT = 587

Could it be because of the content, which looks quirks ?

You (or someone pretending to be you) have asked to register an account at
api-staging.coopstarter.happy-dev.fr.  If this wasn't you, please ignore this email
and your address will be removed from our records.

To activate this account, please click the following link within the next
7 days:

http://api-staging.coopstarter.happy-dev.fr/auth/activate/InZpY3RvcnRlc3Qi:1iZ0YM:ffqkoKnJFOzeYygrjwqwI4NFQdI/

Sincerely,
api-staging.coopstarter.happy-dev.fr Management

I should be able to rewrite the email template to something more appropriate if it fits the providers better. Did you notice the issue @alexandre or @sylvain in any other app ?