diff --git a/sentry.conf.py b/sentry.conf.py
index 9b199c5..4f9311a 100644
--- a/sentry.conf.py
+++ b/sentry.conf.py
@@ -24,6 +24,7 @@
 #  SENTRY_EMAIL_USER
 #  SENTRY_EMAIL_PASSWORD
 #  SENTRY_EMAIL_USE_TLS
+#  SENTRY_EMAIL_LIST_NAMESPACE
 #  SENTRY_ENABLE_EMAIL_REPLIES
 #  SENTRY_SMTP_HOSTNAME
 #  SENTRY_MAILGUN_API_KEY
@@ -282,6 +283,7 @@ ENV_CONFIG_MAPPING = {
     'SENTRY_EMAIL_HOST': 'mail.host',
     'SENTRY_SERVER_EMAIL': 'mail.from',
     'SENTRY_ENABLE_EMAIL_REPLIES': ('mail.enable-replies', Bool),
+    'SENTRY_EMAIL_LIST_NAMESPACE': 'mail.list-namespace',
     'SENTRY_SMTP_HOSTNAME': 'mail.reply-hostname',
     'SENTRY_SECRET_KEY': 'system.secret-key',