asp.net email fails on server when file attached

The email goes suc开发者_运维问答eessfully when I send it from localhost and use an external smtp settings, but email never goes when I run the code on live server and email has attachment. In web.config I have:

 <system.net>
    <mailSettings>
        <smtp>
            <network host="localhost" />
        </smtp>
    </mailSettings>
</system.net>

This problem only arises on live site with email attachment. It works fine on localhost with or without attachment.

I'm not sure, but it could be a problem with your web.config settings. Did you have something like:

  <location path="email" allowOverride="false">
    <system.web>
      <httpRuntime executionTimeout="300" maxRequestLength="15360" />
    </system.web>
  </location>

If your aspx file is under a dir named "email".

This code helped me:

 Dim client As New SmtpClient()
    client.Host = "relay.neural.net.au"
    Try
        client.Send(mailMsg)