diff --git a/src/EventHub.BackgroundServices/Events/EventReminderNotifier.cs b/src/EventHub.BackgroundServices/Events/EventReminderNotifier.cs
index 8dcda3b..e34e048 100644
--- a/src/EventHub.BackgroundServices/Events/EventReminderNotifier.cs
+++ b/src/EventHub.BackgroundServices/Events/EventReminderNotifier.cs
@@ -36,7 +36,7 @@ namespace EventHub.Events
 
         public async Task NotifyAsync(Event @event)
         {
-            if (@event is null)
+            if (@event is null || @event.IsRemindingEmailSent)
             {
                 return;
             }
diff --git a/src/EventHub.BackgroundServices/Events/EventTimingChangeNotifier.cs b/src/EventHub.BackgroundServices/Events/EventTimingChangeNotifier.cs
index cfaf080..c097c5c 100644
--- a/src/EventHub.BackgroundServices/Events/EventTimingChangeNotifier.cs
+++ b/src/EventHub.BackgroundServices/Events/EventTimingChangeNotifier.cs
@@ -36,7 +36,7 @@ namespace EventHub.Events
 
         public async Task NotifyAsync(Event @event)
         {
-            if (@event is null)
+            if (@event is null || @event.IsTimingChangeEmailSent)
             {
                 return;
             }
diff --git a/src/EventHub.BackgroundServices/Events/NewEventNotifier.cs b/src/EventHub.BackgroundServices/Events/NewEventNotifier.cs
index 824563c..8939071 100644
--- a/src/EventHub.BackgroundServices/Events/NewEventNotifier.cs
+++ b/src/EventHub.BackgroundServices/Events/NewEventNotifier.cs
@@ -36,7 +36,7 @@ namespace EventHub.Events
 
         public async Task NotifyAsync(Event @event)
         {
-            if (@event is null)
+            if (@event is null || @event.IsEmailSentToMembers)
             {
                 return;
             }