diff --git a/AssemblyVersion.cs b/AssemblyVersion.cs
index 76c6f64..3c12491 100644
--- a/AssemblyVersion.cs
+++ b/AssemblyVersion.cs
@@ -16,5 +16,5 @@ using System.Reflection;
 //
 // You can specify all the values or you can default the Revision and Build Numbers 
 // by using the '*' as shown below:
-[assembly: AssemblyVersion("3.0.4.575")]
-[assembly: AssemblyFileVersion("3.0.4.575")]
\ No newline at end of file
+[assembly: AssemblyVersion("3.0.4.576")]
+[assembly: AssemblyFileVersion("3.0.4.576")]
\ No newline at end of file
diff --git a/Core/EmailTools.cs b/Core/EmailTools.cs
index 9d1b93c..5529187 100644
--- a/Core/EmailTools.cs
+++ b/Core/EmailTools.cs
@@ -3,36 +3,39 @@ using System;
 using System.Configuration;
 using System.Net;
 using System.Net.Mail;
+using System.Security.Principal;
 using System.Web;
 using System.Web.Security;
 using System.Web.UI;
+using System.Web.UI.HtmlControls;
 using System.Web.UI.WebControls;
 using System.Web.UI.WebControls.WebParts;
-using System.Web.UI.HtmlControls;
 using ScrewTurn.Wiki.PluginFramework;
 
 namespace ScrewTurn.Wiki {
 
-    /// <summary>
-    /// Implements email-related tools.
-    /// </summary>
-    public static class EmailTools {
+	/// <summary>
+	/// Implements email-related tools.
+	/// </summary>
+	public static class EmailTools {
 
-        /// <summary>
-        /// Sends an email.
-        /// </summary>
-        /// <param name="recipient">The recipient.</param>
-        /// <param name="sender">The sender.</param>
-        /// <param name="subject">The subject.</param>
-        /// <param name="body">The message body.</param>
-        /// <param name="html"><c>true</c> if the body is HTML.</param>
-        public static void AsyncSendEmail(string recipient, string sender, string subject, string body, bool html) {
+		/// <summary>
+		/// Sends an email.
+		/// </summary>
+		/// <param name="recipient">The recipient.</param>
+		/// <param name="sender">The sender.</param>
+		/// <param name="subject">The subject.</param>
+		/// <param name="body">The message body.</param>
+		/// <param name="html"><c>true</c> if the body is HTML.</param>
+		public static void AsyncSendEmail(string recipient, string sender, string subject, string body, bool html) {
 			System.Threading.ThreadPool.QueueUserWorkItem(delegate(object state) {
-				MailMessage message = new MailMessage(sender, recipient, subject, body);
-				message.IsBodyHtml = html;
-				TrySendMessage(message);
-			});
-        }
+				using(((WindowsIdentity)state).Impersonate()) {
+					MailMessage message = new MailMessage(sender, recipient, subject, body);
+					message.IsBodyHtml = html;
+					TrySendMessage(message);
+				}
+			}, WindowsIdentity.GetCurrent());
+		}
 
 		/// <summary>
 		/// Tries to send a message, swallowing all exceptions.
@@ -94,15 +97,17 @@ namespace ScrewTurn.Wiki {
 			if(recipients.Length == 0) return;
 
 			System.Threading.ThreadPool.QueueUserWorkItem(delegate(object state) {
-				MailMessage message = new MailMessage(new MailAddress(sender), new MailAddress(sender));
-				message.Subject = subject;
-				message.Body = body;
-				for(int i = 0; i < recipients.Length; i++) {
-					message.Bcc.Add(new MailAddress(recipients[i]));
+				using(((WindowsIdentity)state).Impersonate()) {
+					MailMessage message = new MailMessage(new MailAddress(sender), new MailAddress(sender));
+					message.Subject = subject;
+					message.Body = body;
+					for(int i = 0; i < recipients.Length; i++) {
+						message.Bcc.Add(new MailAddress(recipients[i]));
+					}
+					message.IsBodyHtml = html;
+					TrySendMessage(message);
 				}
-				message.IsBodyHtml = html;
-				TrySendMessage(message);
-			});
+			}, WindowsIdentity.GetCurrent());
 		}
 
 		/// <summary>
diff --git a/Core/StartupTools.cs b/Core/StartupTools.cs
index a1ba0ff..4078c27 100644
--- a/Core/StartupTools.cs
+++ b/Core/StartupTools.cs
@@ -2,6 +2,7 @@
 using System;
 using System.IO;
 using System.Resources;
+using System.Security.Principal;
 using System.Web.Configuration;
 using ScrewTurn.Wiki.PluginFramework;
 
@@ -192,24 +193,26 @@ namespace ScrewTurn.Wiki {
 
 			Log.LogEntry("ScrewTurn Wiki is ready", EntryType.General, Log.SystemUsername);
 
-			System.Threading.ThreadPool.QueueUserWorkItem(ignored => {
-				if((DateTime.Now - Settings.LastPageIndexing).TotalDays > 7) {
-					Settings.LastPageIndexing = DateTime.Now;
-					System.Threading.Thread.Sleep(10000);
-					using(MemoryStream ms = new MemoryStream()) {
-						using(StreamWriter wr = new System.IO.StreamWriter(ms)) {
-							System.Web.HttpContext.Current = new System.Web.HttpContext(new System.Web.Hosting.SimpleWorkerRequest("", "", wr));
-							foreach(var provider in Collectors.PagesProviderCollector.AllProviders) {
-								if(!provider.ReadOnly) {
-									Log.LogEntry("Starting automatic rebuilding index for provider: " + provider.Information.Name, EntryType.General, Log.SystemUsername);
-									provider.RebuildIndex();
-									Log.LogEntry("Finished automatic rebuilding index for provider: " + provider.Information.Name, EntryType.General, Log.SystemUsername);
+			System.Threading.ThreadPool.QueueUserWorkItem(state => {
+				using(((WindowsIdentity)state).Impersonate()) {
+					if((DateTime.Now - Settings.LastPageIndexing).TotalDays > 7) {
+						Settings.LastPageIndexing = DateTime.Now;
+						System.Threading.Thread.Sleep(10000);
+						using(MemoryStream ms = new MemoryStream()) {
+							using(StreamWriter wr = new System.IO.StreamWriter(ms)) {
+								System.Web.HttpContext.Current = new System.Web.HttpContext(new System.Web.Hosting.SimpleWorkerRequest("", "", wr));
+								foreach(var provider in Collectors.PagesProviderCollector.AllProviders) {
+									if(!provider.ReadOnly) {
+										Log.LogEntry("Starting automatic rebuilding index for provider: " + provider.Information.Name, EntryType.General, Log.SystemUsername);
+										provider.RebuildIndex();
+										Log.LogEntry("Finished automatic rebuilding index for provider: " + provider.Information.Name, EntryType.General, Log.SystemUsername);
+									}
 								}
 							}
 						}
 					}
 				}
-			});
+			}, WindowsIdentity.GetCurrent());
 		}
 
 		/// <summary>