diff --git a/stacks/docmost.yml b/stacks/docmost.yml
index feaa95f..46eae74 100644
--- a/stacks/docmost.yml
+++ b/stacks/docmost.yml
@@ -13,7 +13,7 @@ services:
       MAIL_DRIVER: smtp
       SMTP_HOST: ${SMTP_HOST}
       SMTP_PORT: ${SMTP_PORT}
-      SMTP_SECURE: TLS
+      SMTP_SECURE: ${SMTP_SECURE}
       SMTP_IGNORETLS: "true"
       SMTP_USERNAME: ${SMTP_USERNAME}
       SMTP_PASSWORD: ${SMTP_PASSWORD}