.Net 发送邮件

一、邮箱设置

开启MSTP服务，相当于一个授权的过程，开启这个后才可以通过第三方发送邮件。

二、代码实现

.Net中可以通过两个库来实现发邮件 分别为System.Net.Mail和MailKit这两个库。

（1）System.Net.Mail

appsettings.json配置
“Email”: {
“AuthorizationCode”: “*“,
“SendAddress”: “952711409@qq.com”,
“STMP”: “smtp.qq.com”
}

using Microsoft.Extensions.Configuration;
using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Mail;
namespace Rili.DeviceArchive.Utility
{
    public class EmailModel
    {
        public string Subject { get; set; }
        public string Content { get; set; }
        public List<string> ToAddress { get; set; }
        /// <summary>
        /// 抄送地址
        /// </summary>
        public List<string> CarbonCopyAddress { get; set; }
    }
    public class EmailHelper
    {
        public static void SendEmail(EmailModel emailModel)
        {
            try
            {
                IConfigurationBuilder configurationBuilder = new ConfigurationBuilder();
                configurationBuilder.AddJsonFile("appsettings.json");
                IConfigurationRoot root = configurationBuilder.Build();
                var emailRoot = root.GetSection("Email");
                var authorizationCode = emailRoot["AuthorizationCode"].ToString(); //授权码
                var sendAddress = emailRoot["SendAddress"].ToString(); //发起地址
                var STMP = emailRoot["STMP"].ToString();  //STMP服务地址
                MailMessage message = new MailMessage();
                //设置发件人,发件人需要与设置的邮件发送服务器的邮箱一致
                MailAddress fromAddr = new MailAddress(sendAddress);
                message.From = fromAddr;
                //设置收件人
                if (emailModel.ToAddress != null)
                {
                    emailModel.ToAddress.ForEach(toAddress =>
                    {
                        message.To.Add(toAddress);
                    });
                }
                //设置抄送人
                if (emailModel.CarbonCopyAddress != null)
                {
                    emailModel.CarbonCopyAddress.ForEach(carbonCopyAddress =>
                    {
                        message.CC.Add(carbonCopyAddress);
                    });
                }
                //设置邮件标题
                message.Subject = emailModel.Subject;
                //设置邮件内容
                message.Body = emailModel.Content;
                //设置邮件发送服务器,服务器根据你使用的邮箱而不同,可以到相应的 邮箱管理后台查看,下面是QQ的
                SmtpClient client = new SmtpClient(STMP, 25);
                //设置发送人的邮箱账号和密码[授权码]
                client.Credentials = new NetworkCredential(sendAddress, authorizationCode);
                //启用ssl,也就是安全发送
                client.EnableSsl = true;
                client.UseDefaultCredentials = false;
                //发送邮件
                client.Send(message);
            }
            catch (Exception ex)
            {
            }
        }
    }
}

代码调用

EmailModel item = new EmailModel {
    Subject= "主题",
    Content= "邮件内容",
    ToAddress = new List<string>() { "zhanghao.mars@163.com" }
};
EmailHelper.SendEmail(item);

（2）MailKit

安装MailKit包

appsettings.json配置（同上System.Net.Mail）

using Microsoft.Extensions.Configuration;
using MimeKit;
using MimeKit.Text;
using MailKit.Net.Smtp;
using System;
using System.Collections.Generic;

namespace Rili.DeviceArchive.Utility
{
    public class EmailModel
    {
        public string Subject { get; set; }
        public string Content { get; set; }
        public List<string> ToAddress { get; set; }
        /// <summary>
        /// 抄送地址
        /// </summary>
        public List<string> CarbonCopyAddress { get; set; }
    }

    public class EmailHelper
    {
        public static void SendEmail(EmailModel emailModel)
        {
            try
            {
                IConfigurationBuilder configurationBuilder = new ConfigurationBuilder();
                configurationBuilder.AddJsonFile("appsettings.json");
                IConfigurationRoot root = configurationBuilder.Build();
                var emailRoot = root.GetSection("Email");
                var authorizationCode = emailRoot["AuthorizationCode"].ToString();
                var sendEmailAddress = emailRoot["SendEmailAddress"].ToString();
                var STMP = emailRoot["STMP"].ToString();

                MimeMessage message = new MimeMessage();
                //发件人
                message.From.Add(new MailboxAddress("**系统", sendEmailAddress));
                //设置收件人
                string Name = "收件人名称";
                if (emailModel.ToAddress != null)
                {
                    emailModel.ToAddress.ForEach(toAddress =>
                    {
                        message.To.Add(new MailboxAddress(Name, toAddress));
                    });
                }
                //设置抄送人
                if (emailModel.CarbonCopyAddress != null)
                {
                    emailModel.CarbonCopyAddress.ForEach(carbonCopyAddress =>
                    {
                        message.Cc.Add(new MailboxAddress(Name, carbonCopyAddress));
                    });
                }
                //主题
                message.Subject = emailModel.Subject;
                //产生一个支持HTml的TextPart
                TextPart body = new TextPart(TextFormat.Html)
                {
                    Text = emailModel.Content
                };

                //创建Multipart添加附件
                Multipart multipart = new Multipart("mixed");
                multipart.Add(body);
                //附件
                //MimePart attachment = new MimePart()
                //{
                //    ContentObject = new ContentObject(File.OpenRead(absolutePath), ContentEncoding.Default),
                //    ContentDisposition = new ContentDisposition(ContentDisposition.Attachment),
                //    ContentTransferEncoding = ContentEncoding.Base64,
                //    FileName = Path.GetFileName(absolutePath)
                //};
                //multipart.Add(attachment);
                message.Body = multipart;

                using (SmtpClient client = new SmtpClient())
                {
                    //Smtp服务器
                    client.Connect(STMP, 587, false);
                    //登录，发送
                    client.Authenticate(sendEmailAddress, authorizationCode);

                    client.Send(message);
                    //断开
                    client.Disconnect(true);
                }
            }
            catch (Exception ex)
            {

            }
        }
    }
}

代码调用（同上System.Net.Mail）