信箱不可用。服务器响应是：5.7.1无法中继

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问题描述

如果我将邮件发送到客户端域，但是当我尝试向gmail或任何其他域发送邮件时，我有Windows服务邮件发送工作正常我收到错误

邮箱不可用。服务器响应是：5.7.1无法中继

即时通讯使用SMTP进行邮件发送我知道它与SMTP中继有关但我不知道如何解决它请给我解决方案

我尝试过：

 try 
 {
 System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage（）; 
 
 SmtpClient smtp = new SmtpClient（）; 
 
 smtp.Host =172.16.5.2; 
 smtp.EnableSsl = false; 
 smtp.Port = 25; 
 
 msg.From =新邮件地址（客户域邮件ID）; 
 
 msg.To.Add（[email protected]）; 
 
 msg.Subject = subject; 
 
 msg.Body = body; 
 
 msg.IsBodyHtml = true; 
 
 if（AttachmentPath！=）
 {
 msg.Attachments.Add（new Attachment（AttachmentPath））; 
} 
 
 smtp.Send（msg）; 
 
 return（1）; 
 
} 
 catch（exception ex）
 {
 TraceService（ex.Message）; 
 return（0）; 
} 
 
}

解决方案

I have windows service for mail sending its working fine if i send the mail to the client domain but when i try to send mail to gmail or any other domain im getting error

Mailbox unavailable. The server response was: 5.7.1 Unable to relay

im using SMTP for mail sending i know that it is related to SMTP relay but i dont know how to resolve it please give me solution

What I have tried:

try
            {
                System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();

                SmtpClient smtp = new SmtpClient();

                smtp.Host = "172.16.5.2";
                smtp.EnableSsl = false;
                smtp.Port = 25;

                msg.From = new MailAddress("Client domain mail id");

                msg.To.Add("[email protected]");

                msg.Subject = subject;

                msg.Body = body;

                msg.IsBodyHtml = true;

                if (AttachmentPath != "")
                {
                    msg.Attachments.Add(new Attachment(AttachmentPath));
                }

                smtp.Send(msg);

                return (1);

            }
            catch (Exception ex)
            {
                TraceService(ex.Message);
                return (0);
            }

        }

解决方案

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