Steps Involved:
1. Create an event reciever
2. Create a feature to call the reiever when activated.
3. Create a feature stapler to staple the feature to Site Defs.
public override void FeatureActivated(SPFeatureReceiverProperties properties)
{
SPWeb CurrentWeb = properties.Feature.Parent as SPWeb;
String Body = "A Sub Site Created with Title \""+ CurrentWeb.Title+ "\" with the URL "+CurrentWeb.Url;
foreach (SPUser user in CurrentWeb.Groups["AllAlerts"].Users)
{
SPUtility.SendEmail(CurrentWeb, false, false, user.Email, "Site Creation Alert", Body);
}
}
//Use the sharepoint inbuilt capability of sendin and email fron the SPUtility
