Why exception occur while sending mail?

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I want to send mail in VB.net For that I wrote following code

imports System.net.mail

Dim mailclient As SmtpClient = New SmtpClient("MMEX-mailbox"", 25)
mailclient.Send("xyz@mail.com", "abc@mail.com", "Hi", "Hello")

But while running code it will give exception that"mail sending failed"

why such happen anything more require to import or to connect something
or any component is not installed on my computer? What is the problem???
plz tell me anyone know
Thanx in Advance

Posted 22-Feb-10 19:08pm

Tinu 2

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Sandeep Mewara · Answer 1 · 2010-02-22T20:21:00

You need to add info about SMTP in your Web.config file:

XML

<configuration>
  <!-- Add the email settings to the <system.net> element -->
  <system.net>
    <mailSettings>
      <smtp>
        <network 
             host="relayServerHostname" 
             port="portNumber"
             userName="username"
             password="password" />
      </smtp>
    </mailSettings>
  </system.net>
  <system.web>
    ...
  </system.web>
</configuration>

Follow the links for more details:
Sending Email in ASP.NET 2.0 [^]