diff --git a/net/gsmtp/gsmtp_test.go b/net/gsmtp/gsmtp_test.go
new file mode 100644
index 000000000..fcd15350c
--- /dev/null
+++ b/net/gsmtp/gsmtp_test.go
@@ -0,0 +1,77 @@
+// Copyright 2017 gf Author(https://github.com/gogf/gf). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+package gsmtp_test
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/gogf/gf/net/gsmtp"
+)
+
+func TestAddress(t *testing.T) {
+	errMessage := "address is either empty or incorrect"
+
+	errValues := []string{
+		"",
+		":",
+		":25",
+		"localhost:",
+		"local.host:25:28",
+	}
+
+	for _, errValue := range errValues {
+		smtpConnection := gsmtp.New(errValue, "smtpUser@smtp.exmail.qq.com", "smtpPassword")
+		res := smtpConnection.SendMail("sender@local.host", "recipient1@domain.com;recipientN@anotherDomain.cn", "This is subject", "Hi! <br><br> This is body")
+		if !strings.Contains(res.Error(), errMessage) {
+			t.Errorf("Test failed on Address: %s", errValue)
+		}
+	}
+}
+
+func TestFrom(t *testing.T) {
+	errMessage := "from is invalid"
+
+	errValues := []string{
+		"",
+		"qwerty",
+		// "qwe@rty@com",
+		// "@rty",
+		// "qwe@",
+	}
+
+	for _, errValue := range errValues {
+		smtpConnection := gsmtp.New("smtp.exmail.qq.com", "smtpUser@smtp.exmail.qq.com", "smtpPassword")
+		res := smtpConnection.SendMail(errValue, "recipient1@domain.com;recipientN@anotherDomain.cn", "This is subject", "Hi! <br><br> This is body")
+		if !strings.Contains(res.Error(), errMessage) {
+			t.Errorf("Test failed on From: %s", errValue)
+		}
+	}
+
+}
+
+func TestTos(t *testing.T) {
+	errMessage := "tos if invalid"
+
+	errValues := []string{
+		"",
+		"qwerty",
+		"qwe;rty",
+		"qwe;rty;com",
+		// "qwe@rty@com",
+		// "@rty",
+		// "qwe@",
+	}
+
+	for _, errValue := range errValues {
+		smtpConnection := gsmtp.New("smtp.exmail.qq.com", "smtpUser@smtp.exmail.qq.com", "smtpPassword")
+		res := smtpConnection.SendMail("from@domain.com", errValue, "This is subject", "Hi! <br><br> This is body")
+		if !strings.Contains(res.Error(), errMessage) {
+			t.Errorf("Test failed on Tos: %s", errValue)
+		}
+	}
+
+}