diff --git a/compose.yml b/compose.yml
index 79d5752..8605100 100644
--- a/compose.yml
+++ b/compose.yml
@@ -76,6 +76,7 @@ services:
       - SMTP_HOST_PORT
       - SMTP_USER_NAME
       - SMTP_USER_PWD
+      - SMTP_HOST_SSL_ENABLED
       - POSTMARK_API_KEY
       - MAILGUN_API_KEY
       - MAILGUN_DOMAIN