值不能为null在asp.net mvc中发送hotmail或Outlook电子邮件时的参数名称innerstream

如何解决值不能为null在asp.net mvc中发送hotmail或Outlook电子邮件时的参数名称innerstream

我正在使用带有smtp的hotmail或Outlook电子邮件发送电子邮件：asp.net mvc中的smtp-mail.outlook.com。它在本地工作正常，但是在尝试实时发送时会出现此错误“值不能为空。参数名称innerstream”。请提出任何解决方案。感谢adavace。 下面是我的代码，在本地代码上可以完美运行。

------------------------------------这是我的代码------- ------------------

公共静态字符串SendMail（字符串来自，字符串SenderName，字符串[]收件人，字符串主题，字符串主体，字符串_smtp，字符串_autEmail，字符串_autPass，字符串ReplyTo =“”） {

        try
        {

         ComponentInfo.SetLicense("EN-2020Apr13-bFAW7hA9RPNwz2EimPfupBFO+Zvn7eAJFmwMDry8bw3XBOwrbN8zT5uOUMlwhwErECColZkcu0J9Nnp+k91PYjA+yVw==A");

            MailMessage message = new MailMessage();
            message.From.Add(new MailAddress(from,SenderName));
            foreach(var to in recipient)
            {
                message.To.Add(new MailAddress(to.Trim()));
            }
            
            if (!string.IsNullOrEmpty(ReplyTo))
            {
                message.To.Add(new MailAddress(ReplyTo.Trim()));
            }

            message.Subject = subject;             
            message.BodyHtml = body;

        RemoteCertificateValidationCallback validationDelegate =
        (object sender,X509Certificate certificate,X509Chain chain,SslPolicyErrors errors) =>
        {
            if (errors == SslPolicyErrors.None || errors == SslPolicyErrors.RemoteCertificateNameMismatch)
            {                 
                return true;
            }
            else
            {                  
                return false;
            }
        };

            // Create new SmtpClient and specify host,port,security and certificate validation callback.
            using (SmtpClient smtp = new SmtpClient(
                _smtp,465,ConnectionSecurity.Auto,validationDelegate))
            {
                smtp.Connect();
                smtp.Authenticate(_autEmail,_autPass,SmtpAuthentication.Login);
                smtp.SendMessage(message);
                return "1";
            }
        }
        catch (Exception ex)
        {
            return ex.Message;
        }

    }