diff --git a/server/controllers/monitorController.js b/server/controllers/monitorController.js
index c917d1269..5d6a4665e 100755
--- a/server/controllers/monitorController.js
+++ b/server/controllers/monitorController.js
@@ -653,7 +653,7 @@ class MonitorController {
 			const { to } = req.body;
 
 			if (!to || typeof to !== "string") {
-				return res.error({ msg: "A valid recipient email address is required." });
+				return res.error({ msg: this.stringService.errorForValidEmailAddress });
 			}
 
 			const subject = "Test Email from Monitoring System";
diff --git a/server/locales/en.json b/server/locales/en.json
index b53c6d406..5496b0e74 100755
--- a/server/locales/en.json
+++ b/server/locales/en.json
@@ -159,5 +159,6 @@
 	"testNotificationFailed": "Failed to send test notification",
 	"monitorUpAlert": "Uptime Alert: One of your monitors is back online.\n📌 Monitor: {monitorName}\n📅 Time: {time}\n⚠️ Status: UP\n📟 Status Code: {code}\n\u200B\n",
   	"monitorDownAlert": "Downtime Alert: One of your monitors went offline.\n📌 Monitor: {monitorName}\n📅 Time: {time}\n⚠️ Status: DOWN\n📟 Status Code: {code}\n\u200B\n",
-	"sendTestEmail": "Test email sent successfully"
+	"sendTestEmail": "Test email sent successfully",
+	"errorForValidEmailAddress": "A valid recipient email address is required."
 }