C#：通过SMTP发送邮件（带附件）

    class SmtpClass
    {
        //定义默认的 邮件服务器、帐户、密码、发邮件地址
        private static readonly string mailSvr = "192.168.1.1"; //域名也是OK的mail.163.com
        private static readonly string account = "user"; 
        private static readonly string pwd = "mima";
        private static readonly string addr = "[email protected]";

        /// <summary>
        /// 调用SMTP发送邮件
        /// </summary>
        /// <param name="ReciveAddrList">收件人列表</param>
        /// <param name="Subject">主题</param>
        /// <param name="Content">正文</param>
        /// <param name="AttachFile">附件，Dictionary<格件名，详细地址></param>
        /// <returns></returns>
        public static bool SendMail(List<string> ReciveAddrList, string Subject, string Content, Dictionary<string, string> AttachFile)
        {
            using (SmtpClient smtp = new SmtpClient(mailSvr))
            {
                smtp.Credentials = new NetworkCredential(account, pwd);//身份认证

                MailMessage mail = new MailMessage();//建立邮件
                mail.SubjectEncoding = Encoding.GetEncoding("GBK");//主题编码
                mail.BodyEncoding = Encoding.GetEncoding("GBK");//正文编码
                mail.Priority = MailPriority.Normal;//邮件的优先级为中等
                mail.IsBodyHtml = false;//正文为纯文本，如果需要用HTML则为true
                mail.From = new MailAddress(addr);//发件人
                if ((ReciveAddrList == null) || (ReciveAddrList.Count == 0)) //未填写收件人地址
                {
                    return false;
                }
                else
                {
                    foreach (string toAddr in ReciveAddrList)//逐一添加收件人
                    {
                        mail.To.Add(addr);
                    }

                    mail.Subject = Subject;//主题
                    mail.Body = Content;//正文

                    if (AttachFile != null)
                    {
                        foreach (string key in AttachFile.Keys)
                        {
                            Attachment file = new Attachment(AttachFile[key]);
                            file.Name = key;
                            mail.Attachments.Add(file);
                        }
                    }
                    try
                    {
                        smtp.Send(mail);//正式发邮件
                        mail.Dispose(); 
                        smtp.Dispose();
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine(ex.ToString());
                    }
                }

            }
            return true;
        }
    }


	//调用
	SmtpClass.SendMail(
		new List<string> { "[email protected]" },
		"主题",
		DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"),
		new Dictionary<string,string> { { "a.txt", "C:\\a.txt" }, { "b.txt", "C:\\b.txt" } }
		);