C#邮件发送

    public class EmailHelper
    {
        public class MyEmail
        {
            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;   //发送邮件所用的端口号（htmp协议默认为25）
            private string mSenderServerHost;    //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;    //发件箱的密码
            private string mSenderUsername;   //发件箱的用户名（即@符号前面的字符串，例如：hello@163.com，用户名为：hello）
            private bool mEnableSsl;    //是否对邮件内容进行socket层加密传输
            private bool mEnablePwdAuthentication;  //是否对发件人邮箱进行密码验证

            ///<summary>
            /// 构造函数
            ///</summary>
            ///<param name="server">发件箱的邮件服务器地址</param>
            ///<param name="toMail">收件人地址（可以是多个收件人，程序中是以“;"进行区分的）</param>
            ///<param name="fromMail">发件人地址</param>
            ///<param name="subject">邮件标题</param>
            ///<param name="emailBody">邮件内容（可以以html格式进行设计）</param>
            ///<param name="username">发件箱的用户名（即@符号前面的字符串，例如：hello@163.com，用户名为：hello）</param>
            ///<param name="password">发件人邮箱密码</param>
            ///<param name="port">发送邮件所用的端口号（htmp协议默认为25）</param>
            ///<param name="sslEnable">true表示对邮件内容进行socket层加密传输，false表示不加密</param>
            ///<param name="pwdCheckEnable">true表示对发件人邮箱进行密码验证，false表示不对发件人邮箱进行密码验证</param>
            public MyEmail(string server, string toMail, string fromMail, string subject, string emailBody, string username, string password, string port, bool sslEnable, bool pwdCheckEnable)
            {
                try
                {
                    mMailMessage = new MailMessage();
                    mMailMessage.To.Add(toMail);
                    mMailMessage.From = new MailAddress(fromMail);
                    mMailMessage.Subject = subject;
                    mMailMessage.Body = emailBody;
                    mMailMessage.IsBodyHtml = true;
                    mMailMessage.BodyEncoding = System.Text.Encoding.UTF8;
                    mMailMessage.Priority = MailPriority.Normal;
                    this.mSenderServerHost = server;
                    this.mSenderUsername = username;
                    this.mSenderPassword = password;
                    this.mSenderPort = Convert.ToInt32(port);
                    this.mEnableSsl = sslEnable;
                    this.mEnablePwdAuthentication = pwdCheckEnable;
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.ToString());
                }
            }

            ///<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)
            {
                try
                {
                    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);
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.ToString());
                }
            }

            ///<summary>
            /// 邮件的发送
            ///</summary>
            public void Send()
            {
                try
                {
                    if (mMailMessage != null)
                    {
                        mSmtpClient = new SmtpClient();
                        //mSmtpClient.Host = "smtp." + mMailMessage.From.Host;
                        mSmtpClient.Host = this.mSenderServerHost;
                        mSmtpClient.Port = this.mSenderPort;
                        mSmtpClient.UseDefaultCredentials = true;
                        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 = System.Net.Mail.SmtpDeliveryMethod.Network;
                        mSmtpClient.Send(mMailMessage);
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.ToString());
                }
            }

            /// <summary>
            /// 发送邮件
            /// </summary>
            /// <param name="send"></param>
            /// <param name="recieve"></param>
            /// <param name="subject"></param>
            /// <param name="mailbody"></param>
            /// <param name="host"></param>
            /// <param name="uname"></param>
            /// <param name="pwd"></param>
            /// <param name="strFileName"></param>
            public void SendMail(string send, string recieve, string subject, string mailbody, string host, string uname, string pwd, string strFileName)
            {
                //生成一个   使用SMTP发送邮件的客户端对象  
                System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient();
                //生成一个主机IP  
                //client.Port = 25; //587, 465, 995  
                client.Host = host;

                //表示不以当前登录用户的默认凭据进行身份验证  
                client.UseDefaultCredentials = true;
                //包含用户名和密码  
                if (uname != "")
                {
                    client.Credentials = new System.Net.NetworkCredential(uname, pwd);
                }

                //指定如何发送电子邮件。  
                client.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.PickupDirectoryFromIis;
                //通过本机SMTP服务器传送该邮件，  
                //其实使用该项的话就可以随意设定“主机,发件者昵称, 密码”，因为你的IIS服务器已经设定好了。而且公司内部发邮件是不需要验证的。  

                System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage();
                message.To.Add(recieve);
                message.From = new System.Net.Mail.MailAddress(send, uname, System.Text.Encoding.UTF8);
                message.Subject = subject;
                message.Body = mailbody;
                //定义邮件正文，主题的编码方式  
                message.BodyEncoding = System.Text.Encoding.GetEncoding("UTF-8");
                message.SubjectEncoding = System.Text.Encoding.GetEncoding("UTF-8");
                //获取或设置一个值，该值指示电子邮件正文是否为   HTML。  
                message.IsBodyHtml = false;
                //指定邮件优先级  
                message.Priority = System.Net.Mail.MailPriority.High;
                //添加附件  
                //System.Net.Mail.Attachment data = new Attachment(@"E:\9527\tubu\PA260445.JPG", System.Net.Mime.MediaTypeNames.Application.Octet);  
                if (strFileName != "" && strFileName != null)
                {
                    Attachment data = new Attachment(strFileName);
                    message.Attachments.Add(data);
                }

                try
                {
                    //发送  
                    client.Send(message);
                    Console.WriteLine("发送成功！");
                }
                catch (System.Net.Mail.SmtpException ex)
                {
                    Console.WriteLine("发送失败：" + ex.Message);
                }
            }

        }
    }

 

使用方法：

static void Main(string[] args)
        {
            try
            {//使用foxmail发件服务器
                string senderServerHost = "mail.企业.com";
                //目标邮箱
                string toMailAddress = "XX@qq.com";
                //发送邮箱
                string fromMailAddress = "xx@企业.com";
                //测试
                string subjectInfo = "测试fox";
                //内容
                string bodyInfo = "正在测试的内容";
                string mailUsername = "用户名";
                //发送邮箱的授权码
                //string mailPassword = "授权码";
                //发送邮箱的授权码
                string mailPassword = "密码";
                //端口号
                string mailPort = "25";
　　　　　　　　　　//文件全路径
                string attachPath = "D:\\Logger\\202010\\20.log; D:\\Logger\\202010\\22.log;";

                MyEmail email = new MyEmail(senderServerHost, toMailAddress, fromMailAddress, subjectInfo, bodyInfo, mailUsername, mailPassword, mailPort, false, false);
                email.AddAttachments(attachPath);
                email.Send();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }

            Console.ReadKey();
        }

 

发件服务器查看POP3开启

 

 

 

 

感谢：https://www.cnblogs.com/mingmingruyuedlut/archive/2011/10/14/2212255.html