C#发送邮件

以下代码已用 .yeah 、qq 以及本人公司邮箱测试通过，可多发，可挂附件

本次测试邮件发送类，是用的winform

页面如下

窗口的后台代码如下：

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;

 namespace MailServer
 {
     public partial class MailSend : Form
     {
         public MailSend()
         {
             InitializeComponent();
         }

         /// <summary>
         /// 发送按钮  的点击事件
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void btnSend_Click(object sender, EventArgs e)
         {
             string name = txtName.Text.Trim();          //输入邮件地址（发件人的）
             string pwd = txtPwd.Text.Trim();            //输入的邮箱密码（发件人的）
             string content = txtContent.Text.Trim();    //邮件内容
             string recieve = txtRecieve.Text.Trim();    //收件人邮件地址
             string title = txtTitle.Text.Trim();        //邮件标题
             string attachFile = txtFileName.Text;       //附件的路径
             try
             {
                 //调用接口，发送邮件
                 EMailUtil.SendMail(name, pwd, title, content, recieve, attachFile);
                 MessageBox.Show("发送成功");
             }
             catch (Exception)
             {
                 MessageBox.Show("发送失败");
             }

         }

         /// <summary>
         /// 浏览 按钮的点击事件
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void button1_Click(object sender, EventArgs e)
         {

             DialogResult result = OFD.ShowDialog(); //打开文件浏览窗口
             if (result == DialogResult.OK)
             txtFileName.Text = OFD.FileName;        //将附件路径保存到文本框
         }
     }
 }

接口代码如下：

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Net.Mail;

 namespace MailServer
 {
     public class EMailUtil
     {

         /// <summary>
         /// 邮件发送
         /// </summary>
         /// <param name="userName">发件人邮箱地址</param>
         /// <param name="pwd">发件人邮箱密码</param>
         /// <param name="mailSubject">邮件主题</param>
         /// <param name="mailBody">邮件内容</param>
         /// <param name="sendMailAddress">收件人地址(以";"分隔)</param>
         /// <param name="attachment">附件</param>
         public static void SendMail(string userName, string pwd, string mailSubject, string mailBody, string sendMailAddress, string attachment)
         {
             MailMessage m = new MailMessage();
             string[] arrTo = sendMailAddress.Split(';');                        //将以分号分隔的收件人地址拆开
             foreach (string t in arrTo)
             {
                 if (!string.IsNullOrEmpty(t))
                     m.To.Add(new MailAddress(t));                               //添加收件人
             }
             m.From = new MailAddress(userName);                                 //发件人
             m.Subject = mailSubject;                                            //邮件标题
             m.Body = mailBody;                                                  //邮件内容
             m.IsBodyHtml = true;

             m.SubjectEncoding = Encoding.GetEncoding("GB2312");
             m.BodyEncoding = Encoding.GetEncoding("GB2312");
             if (attachment.Length > )
             {
                 m.Attachments.Add(new Attachment(attachment));                  //添加附件
             }
             SmtpClient sm = new SmtpClient();
             sm.Credentials = new System.Net.NetworkCredential(userName, pwd);
             sm.DeliveryMethod = SmtpDeliveryMethod.Network;
             sm.Host = "smtp.yeah.net";                                          //此处是邮件的服务器主机名，如果用163邮箱发送，就写smtp.163.com;126邮箱则写smtp.126.com
             sm.Send(m);
         }
     }
 }

此方法可以正常的发送邮件，

但是有一个尚未解决的问题。就是接口中，最后调用的Send方法没有返回值，这样不容易判断邮件的发送状态。

望大神们有知道的给个方案~在此多谢~