diff --git a/sms4j-provider/src/main/java/org/dromara/sms4j/submail/service/SubMailSmsImpl.java b/sms4j-provider/src/main/java/org/dromara/sms4j/submail/service/SubMailSmsImpl.java
index 9ead7692..16f8ccab 100644
--- a/sms4j-provider/src/main/java/org/dromara/sms4j/submail/service/SubMailSmsImpl.java
+++ b/sms4j-provider/src/main/java/org/dromara/sms4j/submail/service/SubMailSmsImpl.java
@@ -360,6 +360,6 @@ public class SubMailSmsImpl extends AbstractSmsBlend<SubMailConfig> {
 
     private String timestamp(){
         JSONObject resp = http.getUrl("https://api-v4.mysubmail.com/service/timestamp");
-        return resp.getStr("resp");
+        return resp.getStr("timestamp");
     }
 }
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