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", "your@example.com"));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("your@example.com", "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("your@qq.com", "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
