添加引用：Microsoft.Office.Interop.Outlook

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Net.Mail;using System.Net;using Outlook = Microsoft.Office.Interop.Outlook;namespace Common{      public class MailHelper    {          public static void SendMail()         {            Outlook.Application olApp = new Outlook.Application();            Outlook.MailItem mailItem = (Outlook.MailItem)olApp.CreateItem(Outlook.OlItemType.olMailItem);            mailItem.To = "abc@163.com";            mailItem.Subject = DateTime.Now.ToString("yyyyMMdd") + "_报表";            mailItem.BodyFormat = Outlook.OlBodyFormat.olFormatHTML;            string content = "附件为" + DateTime.Now.ToString("yyyyMMdd") + " 数据，请查阅，谢谢！";            content = "各收件人，
 
请重点关注以下内容：
 
" + content + "
 
此邮件为系统自动邮件通知，请不要直接进行回复！谢谢。";            content = content + "
\r\n                                    
Best Regards!\r\n                                    
\r\n                                    
          \r\n                                    
==============================================\r\n                               \r\n                                    
\r\n                                    
\r\n                \r\n             ===============================================";            mailItem.HTMLBody = content;            mailItem.Attachments.Add(@"c:\test.rar");            ((Outlook._MailItem)mailItem).Send();            mailItem = null;            olApp = null;        }    }}

 

在Microsoft Office Outlook中需要配置一个发件人的邮件账户，如果是163之类的免费邮箱，则需要设置“客户端授权密码”，然后使用这个客户端授权密码替换邮箱的登录密码来进行配置，否则是发不了邮件的。

发送成功之后如下图所示：