C＃ - 发送邮件失败

Question

This code works fine on my local machine ut when I deploy it. it gives Failure sending mail error.. Please Help...

MailAddress addrsTo = new MailAddress(toEmail);
MailAddress addrsFrom = new MailAddress("XXX@XXX.com", "XXX Title");

MailMessage mailmsg = new MailMessage(addrsFrom, addrsTo);
mailmsg.Subject = mailSbjct;

mailmsg.Body = "XXX Body";

SmtpClient smtp = new SmtpClient("mail.XXX.com");
smtp.EnableSsl = false;
smtp.Port = 26;
smtp.Credentials = new NetworkCredential("XXX@XXX.com", "XXXXXXX");

try {
    smtp.Send(mailmsg);
} catch (Exception exc) {
    throw new XXXException(1234, "---" + exc.Message);

}

Answer 1

you can try this, if you are using gmail :

 MailMessage mail = new MailMessage();
 mail.Subject = "Your Subject";
 mail.From = new MailAddress("senderMailAddress");
 mail.To.Add("ReceiverMailAddress");
 mail.Body = "Hello! your mail content goes here...";
 mail.IsBodyHtml = true;

 SmtpClient smtp = new SmtpClient("smtp.gmail.com", 587);
 smtp.EnableSsl = true;
 NetworkCredential netCre = new NetworkCredential("SenderMailAddress","SenderPassword" );
 smtp.Credentials = netCre;

 try
  {
   smtp.Send(mail);                
  }
  catch (Exception ex)
  {               
  }

Answer 2

As you have mentioned in your question works fine on my local machine .
It is suggesting that the problem is of credential which you are providing to send the mail.

Edit 1

If you are using you own domain credential then it is not going to work on the server.
The user IIS should have enough authority to send mail.
IIS User More detail
http://www.iis.net/learn/get-started/planning-for-security/understanding-built-in-user-and-group-accounts-in-iis

Here is a SO link
How to send email through IIS7?