.net (c#)实现发送外部邮件的实例

using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.Net.Mail;public partial class testSendMail : System.Web.UI.Page{    protected void Page_Load(object sender, EventArgs e)    {        string strFrom = "xiaoxueli707325@126.com";        string strTo = "shirlly.liao@163.com";        string strSubject = "webtest";        string strBody = "测试";        System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage(strFrom, strTo, strSubject, strBody);        message.BodyEncoding = System.Text.Encoding.UTF8;        message.IsBodyHtml = true;        SendSMTPEMail("smtp.126.com", "xiaoxueli707325@126.com", "111111", message);    }    public void SendSMTPEMail(string strSmtpServer, string strFrom, string strFromPass, MailMessage message)    {        try        {            SmtpClient client = new SmtpClient(strSmtpServer);            client.UseDefaultCredentials = true;            client.Credentials = new System.Net.NetworkCredential(strFrom, strFromPass);            client.DeliveryMethod = SmtpDeliveryMethod.Network;                        client.Send(message);        }        catch (Exception ex)        {            throw new Exception(ex.Message);        }    }}

注意：
1、确保strFrom的值和strSmtpServer的值一致，否之会报Send Error:不允许使用邮箱名称。 服务器响应为: You are not authorized to send mail, authentication is required。的错误
2、确保用于发送邮件的邮箱不是刚注册的邮箱，而要用有提供SMTP服务的邮箱的帐号和密码，否则会报邮箱不可以用的错误
client.UseDefaultCredentials = true;client.Credentials = new System.Net.NetworkCredential(strFrom, strFromPass);
否则会报这样的错误
引用
Send Error:不允许使用邮箱名称。 服务器响应为: You are not authorized to send mail, authentication is required。就是说没有通过登录认证

4、注意126的域名是smtp.126.com
163的域名是smtp.163.com