【发送邮件】通过阿里云服务器发送邮件

写在最前面：

       由于绝大部分云服务器提供商把25端口屏蔽了，所以想要通过25端口在服务器发送邮件基本不成功

       

一、通过阿里云邮件api发送

api发送之前写过一篇介绍：https://www.cnblogs.com/yhnet/p/14439984.html

二、通过SMTP方式发送

1、80端口发送（带附件发送）

#region 通过SMTP发送带附件的邮件（阿里提供的80端口方法可发送）
        /// <summary>
        /// 通过SMTP发送带附件的邮件（阿里提供的80端口方法可发送）
        /// </summary>
        /// <param name="to_mail">收件地址</param>
        /// <param name="from_mail">发件地址</param>
        /// <param name="subject">标题</param>
        /// <param name="name">昵称（可以传入姓名）</param>
        /// <param name="body">内容</param>
        /// <param name="smtp_server">smtp服务器地址</param>
        /// <param name="smtp_password">smtp的密码</param>
        /// <param name="file_address">文件的绝对路径</param>
        /// <returns></returns>
        public static bool SendEmailWithFile(string to_mail, string name, string from_mail, string subject, string body, string smtp_server, string smtp_password, string file_address)
        {
            try
            {
                MailMessage mailMsg = new MailMessage();
                mailMsg.To.Add(new MailAddress(to_mail));
                mailMsg.From = new MailAddress(from_mail, name);
                //可选，设置回信地址 
                //mailMsg.ReplyTo.Add("***");
                // 邮件主题
                mailMsg.Subject = subject;
                // 邮件正文内容
                //string text = body; // "欢迎使用阿里云邮件推送";
                //mailMsg.AlternateViews.Add(AlternateView.CreateAlternateViewFromString(text, null, MediaTypeNames.Text.Plain));

                string html = body;
                mailMsg.AlternateViews.Add(AlternateView.CreateAlternateViewFromString(html, null, MediaTypeNames.Text.Html));

                // 添加附件
                string file = file_address; // "D:\1.txt";
                Attachment data = new Attachment(file, MediaTypeNames.Application.Octet);
                mailMsg.Attachments.Add(data);
                //邮件推送的SMTP地址和端口
                //SmtpClient smtpClient = new SmtpClient("smtpdm.aliyun.com", 25);
                //C#官方文档介绍说明不支持隐式TLS方式，即465端口，需要使用25或者80端口(ECS不支持25端口)，另外需增加一行 smtpClient.EnableSsl = true; 故使用SMTP加密方式需要修改如下：
                SmtpClient smtpClient = new SmtpClient(smtp_server, 80);
                smtpClient.EnableSsl = true;
                // 使用SMTP用户名和密码进行验证
                System.Net.NetworkCredential credentials = new System.Net.NetworkCredential(from_mail, smtp_password);
                smtpClient.Credentials = credentials;
                smtpClient.Send(mailMsg);
                return true;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
                return false;
            }
        }
        #endregion

2、465端口发送（带附件发送）

#region 通过Web.Mail.MailMessage SMTP发送带附件的邮件V2 465端口
        /// <summary>
        /// 通过SMTP发送带附件的邮件2 465端口
        /// </summary>
        /// <param name="toMail">收件人地址</param>
        /// <param name="fromMail">发件人地址</param>
        /// <param name="subject">标题</param>
        /// <param name="body">内容</param>
        /// <param name="smtp_server">smtp服务器地址</param>
        /// <param name="smtp_password">smtp授权密码</param>
        /// <param name="file_address">文件绝对路径</param>
        /// <returns></returns>
        public static bool SendEmailWithFile_V2(string toMail, string fromMail, string subject, string body, string smtp_server, string smtp_password, string file_address)
        {
            System.Web.Mail.MailMessage mail = new System.Web.Mail.MailMessage();
            try
            {
                mail.To = toMail;
                mail.From = fromMail;
                mail.Subject = subject;
                mail.BodyFormat = System.Web.Mail.MailFormat.Html;
                mail.Body = body;

                mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1"); //身份验证
                mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", mail.From); //邮箱登录账号，这里跟前面的发送账号一样就行
                mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", smtp_password); //这个密码要注意：如果是一般账号，要用授权码；企业账号用登录密码
                mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpserverport", 465);//端口
                mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpusessl", "true");//SSL加密
                string file = file_address; // "D:\1.txt";
                System.Web.Mail.MailAttachment oAttch = new System.Web.Mail.MailAttachment(file, System.Web.Mail.MailEncoding.Base64);
                mail.Attachments.Add(oAttch);
                System.Web.Mail.SmtpMail.SmtpServer = smtp_server;    //企业账号用smtp.exmail.qq.com
                System.Web.Mail.SmtpMail.Send(mail);

                return true;
            }
            catch (Exception ex)
            {
                //失败，错误信息：ex.Message;
                Console.WriteLine(ex.Message);
                return false;
            }
        }
        #endregion

PS：80端口发送是阿里云邮件发送帮助文档里介绍的方法，465端口是在网友总结的方法基础上增加了附件

参考自：https://www.bbsmax.com/A/kjdw0m92zN/