.NET Core 邮件发送使用库MailKit

安装库MailKit

 发送邮件

 /// <summary>
 /// 发送邮件
 /// </summary>
 /// <param name="subject">邮件主题</param>
 /// <param name="body">邮件内容</param>
 public void SendEmail(string subject, string body)
 {
     var message = new MimeMessage();
     message.From.Add(new MailboxAddress("邮箱的名称", "[email protected]"));
     message.To.Add(new MailboxAddress("邮箱的名称", "接收方@exam.com"));
     message.Subject = subject;

     var bodyBuilder = new BodyBuilder
     {
         HtmlBody = body
     };

     message.Body = bodyBuilder.ToMessageBody();

     using (var smtpClient = new SmtpClient())
     {
         smtpClient.Connect("smtp.qq.com", 465, true); // 服务器地址、端口、加密方式 ssl加密端口465、587  以QQ邮箱为例，具体的服务器地址去对应邮箱官网获取
         smtpClient.Authenticate("[email protected]", "授权码"); // 邮箱登录凭证
         smtpClient.Send(message);
         smtpClient.Disconnect(true);
     }
 }

注：

关于授权码，需要去发送方邮箱的官网获取授权码，以QQ邮箱为例，登录QQ邮箱进入设置=》账号=》账号安全=》开启服务，跟着指示向下执行，就很可以获取授权码

收取邮件

 /// <summary>
 /// 收取邮件
 /// </summary>
 /// <returns></returns>
 public async Task ReceiveEmailAsync()
 {
     using (var client=new ImapClient())
     {
         await client.ConnectAsync("imap.qq.com", 993,true);//ssl 端口993 以QQ邮箱为例
         await client.AuthenticateAsync("[email protected]", "授权码");
         var inbox = client.Inbox;
         await inbox.OpenAsync(MailKit.FolderAccess.ReadOnly);
         foreach(var uid in await inbox.SearchAsync(SearchQuery.NotSeen))//此处获取未查看的邮件
         {
             var message=await inbox.GetMessageAsync(uid);
             Console.WriteLine($"Subject:{message.Subject}");
         }
         await client.DisconnectAsync(true);
     }
 }

注：根据需求向inbox.SearchAsync（）中传入需要查看邮件的分类