added the example for gsmtp

.example/net/gsmtp/gsmtp_sendMail.go

@@ -0,0 +1,24 @@
+// 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 main
+
+import (
+	"fmt"
+
+	"github.com/gogf/gf/net/gsmtp"
+)
+
+func main() {
+
+	// create the SMTP connection
+	smtpConnection := gsmtp.New("smtp.exmail.qq.com", "smtpUser@smtp.exmail.qq.com", "smtpPassword")
+	// or you can specify the port explicitly
+	// smtpConnection := smtp.New("smtp.exmail.qq.com:25", "smtpUser@smtp.exmail.qq.com", "smtpPassword")
+
+	// send the Email
+	fmt.Println(smtpConnection.SendMail("sender@local.host", "recipient1@domain.com;recipientN@anotherDomain.cn", "This is subject", "Hi! <br><br> This is body"))
+
+}