调用MailMessage发送邮件

    /// <summary>
    /// 邮件类
    /// </summary>
    public class SendMail
    {
        #region 私有变量
        private string fromEmail;
        private string fromPwd;
        private List<string> receiveEmail = new List<string>();
        private string subject;
        private string body;
        private string host;
        private int port;
        #endregion

        #region 公共变量
        /// <summary>
        /// 用于发送邮件的邮箱账号
        /// </summary>
        public string FromEmail
        {
            get { return fromEmail; }
            set { fromEmail = value; }
        }

        /// <summary>
        /// 用于发送邮件的邮箱密码
        /// </summary>
        public string FromPwd
        {
            get { return fromPwd; }
            set { fromPwd = value; }
        }

        /// <summary>
        /// 接收邮件的邮箱
        /// </summary>
        public List<string> ReceiveEmail
        {
            get { return receiveEmail; }
            set { receiveEmail = value; }
        }

        /// <summary>
        /// 邮件主题
        /// </summary>
        public string Subject
        {
            get { return subject; }
            set { subject = value; }
        }

        /// <summary>
        /// 邮件内容
        /// </summary>
        public string Body
        {
            get { return body; }
            set { body = value; }
        }

        /// <summary>
        /// SMTP服务的主机名称或IP地址
        /// </summary>
        public string Host
        {
            get { return host; }
            set { host = value; }
        }

        /// <summary>
        /// 端口号
        /// </summary>
        public int Port
        {
            get { return port; }
            set { port = value; }
        }
        #endregion

        #region 构造函数
        /// <summary>
        /// 构造 赋值
        /// </summary>
        public SendMail()
        {
            fromEmail = "";
　　　　　　　//这里应该为邮箱授权码
            fromPwd = "";
            subject = "";
            body = "！";
            host = "";
            port = ;
        }
        #endregion

        #region 发送邮件
        /// <summary>
        /// 发送邮件
        /// </summary>
        /// <param name="errorMsg"></param>
        /// <param name="lstFileName">附件路径集合</param>
        /// <returns></returns>
        public bool Send(out string errorMsg, List<string> lstFileName = null)
        {
            errorMsg = string.Empty;
            try
            {
                MailMessage mailMsg = new MailMessage();
                mailMsg.From = new MailAddress(fromEmail);
                mailMsg.Subject = subject;
                mailMsg.Body = body;

                if (receiveEmail.Count < 1) { errorMsg = "收件人为空"; return false; }
                foreach (string item in receiveEmail)
                {
                    mailMsg.To.Add(item);
                }

                #region 添加附件
                if (lstFileName != null)
                {
                    foreach (var item in lstFileName)
                    {
                        mailMsg.Attachments.Add(new Attachment(item));
                    }
                }
                #endregion

                SmtpClient client = new SmtpClient();
                client.Host = host;
                client.Port = port;
                client.Credentials = new NetworkCredential(fromEmail, fromPwd);
                client.EnableSsl = true;
                client.DeliveryFormat = System.Net.Mail.SmtpDeliveryFormat.International;
                client.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
                client.Send(mailMsg);
            }
            catch (Exception ex)
            {
                errorMsg = ex.Message;
                return false;
            }
            return true;
        }

        /// <summary>
        /// 异步发送邮件
        /// </summary>
        ///<param name="lstFileName">附件路径集合</param>
        /// <param name="errorMsg"></param>
        public async Task<bool> SendAsync(List<string> lstFileName = null)
        {
            try
            {
                MailMessage mailMsg = new MailMessage();
                mailMsg.From = new MailAddress(fromEmail);
                mailMsg.Subject = subject;
                mailMsg.Body = body;
                if (receiveEmail.Count < 1) { return false; }
                foreach (string item in receiveEmail)
                {
                    mailMsg.To.Add(item);
                }

                #region 添加附件
                if (lstFileName != null)
                {
                    foreach (var item in lstFileName)
                    {
                        mailMsg.Attachments.Add(new Attachment(item));
                    }
                }
                #endregion

                SmtpClient client = new SmtpClient();
                client.Host = host;
                client.Port = port;
                client.Credentials = new NetworkCredential(fromEmail, fromPwd);
                client.EnableSsl = true;
                await client.SendMailAsync(mailMsg);
            }
            catch
            {
                return false;
            }
            return true;
        }
        #endregion
    }

 注意，传过来的参数为附件的路径，并且这里的密码应为邮箱授权码。