diff --git a/mailserver.env b/mailserver.env
index 0d3c0423..2b1dd8e8 100644
--- a/mailserver.env
+++ b/mailserver.env
@@ -134,6 +134,11 @@ POSTFIX_DAGENT=
 # empty => 0
 POSTFIX_MAILBOX_SIZE_LIMIT=
 
+# See https://docker-mailserver.github.io/docker-mailserver/edge/config/user-management/accounts/#notes
+# 0 => Dovecot quota is disabled
+# 1 => Dovecot quota is enabled
+ENABLE_QUOTAS=1
+
 # Set the message size limit for all users. If set to zero, the size will be unlimited (not recommended!)
 #
 # empty => 10240000 (~10 MB)