EmailHelper

注：个人邮箱发送时需要将邮箱密码设置为邮件授权码

邮件发送帮助类一：

public class EmailHelper
    {
        /// <summary>
        /// 发送邮件
        /// </summary>
        /// <param name="To">收件地址</param>
        /// <param name="Name">收件人</param>
        /// <param name="Subject">标题</param>
        /// <param name="Content">内容</param>
        /// <returns></returns>
        public static bool SendEmail(string To, string Name, string Subject, string Content)
        {
            SmtpClient client = new SmtpClient();

            //获取或设置用于验证发件人身份的凭据。
            client.Credentials = new System.Net.NetworkCredential("邮箱地址", "密码");
            client.Port =25; //端口号
            //获取或设置用于 SMTP 事务的主机的名称或 IP 地址（这里是qq的,163邮箱的是smtp.163.com）
            client.Host = "smtp.qq.com";
            try
            {
                client.Send(InitMailMessage(To, Name, Subject, Content));
                return true;
            }
            catch (System.Net.Mail.SmtpException ex)
            {
                return false;
            }
        }

        /// <summary>
        /// 初始化信件相关信息
        /// </summary>
        /// <param name="To">收件地址</param>
        /// <param name="name">收件人</param>
        /// <param name="Subject">标题</param>
        /// <param name="sendEmailContent">内容</param>
        /// <returns></returns>
        private static MailMessage InitMailMessage(string To, string name, string Subject, string sendEmailContent)
        {
            MailMessage mail = new MailMessage();
            //发件人
            mail.From = new MailAddress("邮箱地址", "设置个名称");
            
            //收件人
            if (name != "")
            {
                MailAddress mailAdd = new MailAddress(To, name);
                mail.To.Add(mailAdd);
            }
            else
            {
                mail.To.Add(To);
            }
            //主题
            mail.Subject = Subject;

            //内容
            mail.Body = sendEmailContent;

            //邮件主题和正文的编码格式
            mail.SubjectEncoding = System.Text.Encoding.UTF8;
            mail.BodyEncoding = System.Text.Encoding.UTF8;

            //邮件正文允许html编码
            mail.IsBodyHtml = true;
            //优先级
            mail.Priority = MailPriority.Normal;

            //密送——就是将信密秘抄送给收件人以外的人，所有收件人看不到密件抄送的地址
            //mail.Bcc.Add("");


            //抄送——就是将信抄送给收件人以外的人,所有的收件人可以在抄送地址处看到此信还抄送给谁
            mail.CC.Add("抄送人地址");

            mail.Attachments.Add(new Attachment(@"G:\2018\vue-devtools.zip"));     //添加附件

            return mail;

        }
    }

邮件发送帮助类二（感觉这个发的快一点）：

public class EmailHelper
    {
        private MailMessage mMailMessage;   //主要处理发送邮件的内容（如：收发人地址、标题、主体、图片等等）
        private SmtpClient mSmtpClient; //主要处理用smtp方式发送此邮件的配置信息（如：邮件服务器、发送端口号、验证方式等等）
        private int mSenderPort = 25;   //发送邮件所用的端口号（htmp协议默认为25）
        private string mSenderServerHost = "smtp.exmail.qq.com";    //发件箱的邮件服务器地址（IP形式或字符串形式均可）
        private string mSenderPassword = "密码";    //发件箱的密码
        private string mSenderUsername = "发件箱的用户名";   //发件箱的用户名
        private bool mEnableSsl = false;    //是否对邮件内容进行socket层加密传输
        private bool mEnablePwdAuthentication = true;  //是否对发件人邮箱进行密码验证
        private string fromMail = "发件箱的地址";  //发件箱的地址(与用户名一致)


        /// <summary>
        /// 发送邮件
        /// </summary>
        /// <param name="Receive">接收人邮箱</param>
        /// <param name="subject">标题</param>
        /// <param name="emailBody">邮件内容</param>
        /// <param name="cc">抄送人邮箱</param>
        public EmailHelper(List<string> Receive, string subject, string emailBody,List<string>cc)
        {

            mMailMessage = new MailMessage();
            foreach (string item in Receive)
            {
                mMailMessage.To.Add(item);
            }
            mMailMessage.From = new MailAddress(fromMail);
            mMailMessage.Subject = subject;
            mMailMessage.Body = emailBody;
            mMailMessage.IsBodyHtml = true;
            mMailMessage.BodyEncoding = System.Text.Encoding.UTF8;
            mMailMessage.Priority = MailPriority.Normal;
            foreach (string item in cc)
            {
                mMailMessage.To.Add(item);
            }

        }

        ///<summary>
        /// 添加附件
        ///</summary>
        ///<param name="attachmentsPath">附件的路径集合，以分号分隔</param>
        public void AddAttachments(string attachmentsPath)
        {

            string[] path = attachmentsPath.Split(';'); //以什么符号分隔可以自定义
            Attachment data;
            ContentDisposition disposition;
            for (int i = 0; i < path.Length; i++)
            {
                data = new Attachment(path[i], MediaTypeNames.Application.Octet);
                disposition = data.ContentDisposition;
                disposition.CreationDate = File.GetCreationTime(path[i]);
                disposition.ModificationDate = File.GetLastWriteTime(path[i]);
                disposition.ReadDate = File.GetLastAccessTime(path[i]);
                mMailMessage.Attachments.Add(data);
            }

        }

        ///<summary>
        /// 邮件的发送
        ///</summary>
        public void Send()
        {

            if (mMailMessage != null)
            {
                mSmtpClient = new SmtpClient();
                mSmtpClient.Host = this.mSenderServerHost;
                mSmtpClient.Port = this.mSenderPort;
                mSmtpClient.UseDefaultCredentials = false;
                mSmtpClient.EnableSsl = this.mEnableSsl;
                if (this.mEnablePwdAuthentication)
                {
                    System.Net.NetworkCredential nc = new System.Net.NetworkCredential(this.mSenderUsername, this.mSenderPassword);
                    //mSmtpClient.Credentials = new System.Net.NetworkCredential(this.mSenderUsername, this.mSenderPassword);
                    //NTLM: Secure Password Authentication in Microsoft Outlook Express
                    mSmtpClient.Credentials = nc.GetCredential(mSmtpClient.Host, mSmtpClient.Port, "NTLM");
                }
                else
                {
                    mSmtpClient.Credentials = new System.Net.NetworkCredential(this.mSenderUsername, this.mSenderPassword);
                }
                mSmtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
                mSmtpClient.Send(mMailMessage);
            }

        }
    }