diff --git a/apps/OpenSignServer/cloud/parsefunction/sendMailv3.js b/apps/OpenSignServer/cloud/parsefunction/sendMailv3.js
index 5c44e5b88..874919511 100644
--- a/apps/OpenSignServer/cloud/parsefunction/sendMailv3.js
+++ b/apps/OpenSignServer/cloud/parsefunction/sendMailv3.js
@@ -18,7 +18,7 @@ async function sendMailProvider(req, plan, monthchange) {
         port: process.env.SMTP_PORT || 465,
         secure: smtpsecure,
         auth: {
-          user: process.env.SMTP_USER_EMAIL,
+          user: process.env.SMTP_USERNAME ? process.env.SMTP_USERNAME : process.env.SMTP_USER_EMAIL,
           pass: process.env.SMTP_PASS,
         },
       });
diff --git a/apps/OpenSignServer/index.js b/apps/OpenSignServer/index.js
index 26b16b5f9..9109bf9e1 100644
--- a/apps/OpenSignServer/index.js
+++ b/apps/OpenSignServer/index.js
@@ -62,7 +62,7 @@ if (smtpenable) {
       port: process.env.SMTP_PORT || 465,
       secure: smtpsecure,
       auth: {
-        user: process.env.SMTP_USER_EMAIL,
+        user: process.env.SMTP_USERNAME ? process.env.SMTP_USERNAME : process.env.SMTP_USER_EMAIL,
         pass: process.env.SMTP_PASS,
       },
     });