How can i eliminate this error??

Question

MailMessage mail = new MailMessage();
        mail.To = "[email protected]";
        mail.From = "[email protected]";
        mail.Subject = "this is a test email.";
        mail.Body = "this is my test email body.";
        MailAttachment attachment = new MailAttachment(Server.MapPath("somemail1.txt")); //create the attachment
        mail.Attachments.Add(attachment);   //add the attachment
        SmtpMail.SmtpServer = "localhost"; //your real server goes here
        SmtpMail.Send(mail);

While running this code Im gettin error saying:transport failed to connect to the server

Pedro Barbas · Answer

hi This is a network related error. Your application cannot connect to the mail server specified SmtpMail.SmtpServer you must check this: Is a valid SMTP Server Check to be sure the server System.Web.Mail is executing on can connect to the mail server. Some times firewalls or proxy servers can get in the way. Try specifying the value by IP address. Poor DNS resolution can sometimes hinder name lookups. Make sure the that the mail server is running at port 25. If you did not specify a SmtpMail.SmtpServer property or if SmtpMail.SmtpServer points to localhost (or the equivalent) be sure the SMTP Service is running on port 25. For testing purposes change the MailMessage.From and MailMessage.To properties to an address that exists on SmtpMail.SmtpServer. Some times this exception is thrown when it really is a relay issue. dont forget to mark this as Accepted Answer if you liked it

Roei Bar · Answer

check with your system admins if if port 25 is permitted to the smtp server otherwise ask them what port is open and set the SMTP.Port to it. the Exception is as said before me that you are not permitted to connect to the Server you can test this by trying to Telnet 25 if you fail do the above if you succeed write it down and i will see if i can figure it out :-)