public static async Task<bool> SendMailAsync22(string Name, string receive, string sender, string password, string host, int port, string subject, string body)
    {
        try
        {
//# MimeMessage代表一封电子邮件的对象
            var message = new MimeMessage();
//# 添加发件人地址 Name 发件人名字 sender 发件人邮箱
            message.From.Add(new MailboxAddress(Name, sender));
//# 添加收件人地址
            message.To.Add(new MailboxAddress("", receive));
//# 设置邮件主题信息
            message.Subject = subject;
//# 设置邮件内容
            var bodyBuilder = new BodyBuilder() { HtmlBody = body };
            message.Body = bodyBuilder.ToMessageBody();
            using (var client = new SmtpClient())
            {
                // For demo-purposes, accept all SSL certificates (in case the server supports STARTTLS)
                client.ServerCertificateValidationCallback = (s, c, h, e) => true;
                // Note: since we don‘t have an OAuth2 token, disable  
                // the XOAUTH2 authentication mechanism.  
                client.AuthenticationMechanisms.Remove("XOAUTH2");
                client.CheckCertificateRevocation = false;
                //client.SslProtocols = System.Security.Authentication.SslProtocols.Tls12;
                client.Connect(host, port, MailKit.Security.SecureSocketOptions.Auto);
                // Note: only needed if the SMTP server requires authentication
                client.Authenticate(sender, password);
                await client.SendAsync(message);
                client.Disconnect(true);
                return true;
            }
        }
        catch (Exception ex)
        {
           throw ex;
        }
        return false;
    }