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;

    }