You've only provided part of the information needed. It cannot be made up values it has to be a real email account and you need to also know the server name for the mail server, the port may also be different than the default value of 25 and other settings can also vary by email provider.
So based on what you've provided the first 4 needed things are unknown to me but I have entered the 2 values that you did provide in the last 2 settings below. I have no idea what "username website1" in your example corresponds to.
<add key="SMTPServer" value="localhost" />
<add key="SMTPRequiresAuthentication" value="false" />
<add key="SMTPPort" value="25" />
<add key="SMTPUseSsl" value="false" />
<add key="SMTPUser" value="noreply@website.com" />
<add key="SMTPPassword" value="123456" />
but localhost is most likely not correct. Assuming noreply@website.com is a place holder for a real email account then you would also need to put the same email address in Site Settings as the Default from address.
So you basically copy this into you user.config and set the values to correct values for your email account and email server and you may need to touch Web.config to make it see your setting changes in user.config.
If you enter correct settings it will work when you test the contact form, if you enter an address to receive contact form notification in the contact form settings. But if you don't have correct settings it will not work and you will likely see errors in the log related to email.
If your web host is providing email accounts for you then you may need to get the additional setting information from your host.
Hope it helps,
Joe