How do i obtain my smtp host?

i program a site. and i want to send a message to the user.. now in asp.net in the config file.. i put this:

<mailSettings>

  <smtp from="makovetskiyd@yahoo.co.uk">

    <network host="localhost" port="25" userName="username" password="secret" defaultCredentials="true" />

  </smtp>

</mailSettings>

i have no idea how the network host acts and what it does.. i want to change it to the server that holds my yahoo account. i understand that smtp is some email server that sends emails out.. but how do i put obtain it? how does it look like,? is it an int, is it a string?!?

 MailMessage message = new MailMessage();

    message.From = new MailAddress("makovetskiyd@yahoo.co.uk");



    message.To.Add(new MailAddress("makovetskiyd@yahoo.co.uk"));




    message.CC.Add(new MailAddress("makovetskiyd@yahoo.co.uk"));

    message.Subject = "This is my subject";

    message.Body = "This is the content";



    SmtpClient client = new SmtpClient();

    client.Send(message);

config file:

    <mailSettings>

  <smtp from="makovetskiyd@yahoo.co.uk">

    <network host开发者_Python百科="smtp.yahoo.com" port="25" userName="username" password="secret" defaultCredentials="true" />// where do i get the host?!? the host prevents me from sending an email

  </smtp>

</mailSettings>

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Look at Yahoo! Mail help pages for settings for their SMTP server. It looks like you need to be a Yahoo! Mail Plus account holder to access POP and SMTP servers however. Maybe you can use another mail account - your web hosting provider's SMTP server would be the best one to use. Read your web host's help pages.

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Network host is the address of the physical server (SMTP server) that will handle the sending of email. It could be in a form of IP address or a domain name (e.g. mail.mydomain.com). If you are working on a company they should provide this to you,

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using System.Configuration;
using System.Web.Configuration;
using System.Net.Configuration;

Configuration configurationFile = WebConfigurationManager.OpenWebConfiguration("PathToConfigFile");

Alternative

configurationFile = WebConfigurationManager.OpenWebConfiguration(HttpContext.Current.Request.ApplicationPath)

MailSettingsSectionGroup mailSettings = configurationFile.GetSectionGroup("system.net/mailSettings") as MailSettingsSectionGroup;