diff --git a/src/addons.js b/src/addons.js
index ef544d238..295faf737 100644
--- a/src/addons.js
+++ b/src/addons.js
@@ -394,6 +394,7 @@ function setupSendMail(app, options, callback) {
         'MAIL_SMTP_SERVER=mail',
         'MAIL_SMTP_PORT=2500', // if you change this, change the mail container
         'MAIL_SMTP_USERNAME=' + username,
+        'MAIL_SMTP_PASSWORD=' + hat(256), // this is ignored
         'MAIL_DOMAIN=' + config.fqdn()
     ];