.net core 利用qq发送邮件

1、进入qq邮箱首页，点击设置

 2、点击 账户 选项卡 ，划到大概中间部分，有一个服务选项区。经实验开启前两个就可以了。

3、点击下方的 生成授权码，在开启服务之后会自动生成一次。这一步如果绑定了密保，会先进行一次身份验证。验证之后会发放一个授权码。这个授权码，在程序里会用到。

*******************************************************代码部分*******************************************************

public class EmailService : IEmailService

    {
        private readonly IConfiguration _configuration;
        public EmailService(IConfiguration configuration)
        {
            _configuration = configuration;
        }

        public async Task SendEmailAsync(MimeMessage message)
        {
            var host = "smtp.qq.com";
            var port = 465;
            var useSsl = true;
            var from_username = "*******@qq.com";
            // 授权码
            var from_password = "********";
            var from_name = "好医生";
            var from_address = "********@qq.com";

            var address = new List<MailboxAddress>
            {
                new MailboxAddress("123456","123456@qq.com"),
                new MailboxAddress("56789","56789@qq.com")
            };

            message.From.Add(new MailboxAddress(from_name, from_address));
            message.To.AddRange(address);

            using var client = new SmtpClient
            {
                ServerCertificateValidationCallback = (s, c, h, e) => true
            };
            client.AuthenticationMechanisms.Remove("XOAUTH2");

            await client.ConnectAsync(host, port, useSsl);
            await client.AuthenticateAsync(from_username, from_password);
            await client.SendAsync(message);
            await client.DisconnectAsync(true);
        }
    }

 调用

var message = new MimeMessage
            {
                Subject = "程序异常",
                Body = new BodyBuilder
                {
                    HtmlBody = msg
                }.ToMessageBody()
            };

            await _emailService.SendEmailAsync(message);