diff --git a/dash/orgs/views.py b/dash/orgs/views.py
index 6c7e0e0..43752ea 100644
--- a/dash/orgs/views.py
+++ b/dash/orgs/views.py
@@ -356,15 +356,14 @@ class InviteForm(forms.ModelForm):
             )
 
             def clean_emails(self):
-                emails = self.cleaned_data["emails"].lower().strip()
-                if emails:
-                    email_list = emails.split(",")
-                    for email in email_list:
-                        try:
-                            validate_email(email)
-                        except ValidationError:
-                            raise forms.ValidationError(_("One of the emails you entered is invalid."))
-                return emails
+                emails = self.cleaned_data["emails"]
+                email_list = list(dict.fromkeys(email.strip().lower() for email in emails.split(",") if email.strip()))
+                for email in email_list:
+                    try:
+                        validate_email(email)
+                    except ValidationError:
+                        raise forms.ValidationError(_("One of the emails you entered is invalid."))
+                return ",".join(email_list)
 
             class Meta:
                 model = Invitation
@@ -422,28 +421,28 @@ def post_save(self, obj):
 
             user_group = cleaned_data["user_group"]
 
-            emails = cleaned_data["emails"].lower().strip()
-            email_list = emails.split(",")
+            # emails is already normalized by clean_emails: comma-joined, stripped, lowercased and de-duplicated
+            emails = cleaned_data["emails"]
+            email_list = emails.split(",") if emails else []
 
-            if emails:
-                for email in email_list:
-                    # if they already have an invite, update it
-                    invites = Invitation.objects.filter(email=email, org=org).order_by("-pk")
-                    invitation = invites.first()
+            for email in email_list:
+                # if they already have an invite, update it
+                invites = Invitation.objects.filter(email=email, org=org).order_by("-pk")
+                invitation = invites.first()
 
-                    if invitation:
-                        # remove any old invites
-                        invites.exclude(pk=invitation.pk).delete()
+                if invitation:
+                    # remove any old invites
+                    invites.exclude(pk=invitation.pk).delete()
 
-                        invitation.user_group = user_group
-                        invitation.is_active = True
-                        invitation.save()
-                    else:
-                        invitation = Invitation.objects.create(
-                            email=email, org=org, user_group=user_group, created_by=user, modified_by=user
-                        )
+                    invitation.user_group = user_group
+                    invitation.is_active = True
+                    invitation.save()
+                else:
+                    invitation = Invitation.objects.create(
+                        email=email, org=org, user_group=user_group, created_by=user, modified_by=user
+                    )
 
-                    invitation.send_invitation()
+                invitation.send_invitation()
 
             # remove all the org users
             for user in self.get_object().get_org_admins():
diff --git a/test_runner/tests.py b/test_runner/tests.py
index 0dcfdf0..be25c6a 100644
--- a/test_runner/tests.py
+++ b/test_runner/tests.py
@@ -1,6 +1,5 @@
 import zoneinfo
-from dash.tags.models import Tag
-from unittest.mock import Mock, patch, call
+from unittest.mock import Mock, call, patch
 
 import valkey
 from smartmin.tests import SmartminTest
@@ -24,9 +23,11 @@
 from dash.orgs.models import Invitation, Org, OrgBackend, OrgBackground, TaskState
 from dash.orgs.tasks import org_task
 from dash.orgs.templatetags.dashorgs import display_time, national_phone
+from dash.orgs.views import OrgCRUDL
 from dash.stories.models import Story, StoryImage
-from dash.utils import random_string
+from dash.tags.models import Tag
 from dash.test import MockResponse
+from dash.utils import random_string
 
 
 class UserTest(SmartminTest):
@@ -1012,6 +1013,39 @@ def test_manage_accounts(self):
         self.assertEqual(3, Invitation.objects.all().count())
         self.assertEqual(4, len(mail.outbox))
 
+        # emails with surrounding whitespace and a trailing comma are tolerated
+        post_data["emails"] = "spaced1@nyaruka.com, spaced2@nyaruka.com ,"
+        post_data["user_group"] = "E"
+        response = self.client.post(manage_accounts_url, post_data, SERVER_NAME="uganda.ureport.io")
+        self.assertEqual(302, response.status_code)
+
+        # 2 new invitations are created with clean addresses
+        self.assertEqual(5, Invitation.objects.all().count())
+        self.assertEqual(6, len(mail.outbox))
+        self.assertTrue(Invitation.objects.filter(email="spaced1@nyaruka.com", user_group="E").exists())
+        self.assertTrue(Invitation.objects.filter(email="spaced2@nyaruka.com", user_group="E").exists())
+
+        # duplicate addresses are collapsed to a single invitation and email
+        post_data["emails"] = "dup@nyaruka.com, dup@nyaruka.com"
+        post_data["user_group"] = "E"
+        response = self.client.post(manage_accounts_url, post_data, SERVER_NAME="uganda.ureport.io")
+        self.assertEqual(302, response.status_code)
+        self.assertEqual(6, Invitation.objects.all().count())
+        self.assertEqual(7, len(mail.outbox))
+        self.assertEqual(1, Invitation.objects.filter(email="dup@nyaruka.com").count())
+
+        # separator-only input is treated as no emails
+        post_data["emails"] = " , , "
+        response = self.client.post(manage_accounts_url, post_data, SERVER_NAME="uganda.ureport.io")
+        self.assertEqual(302, response.status_code)
+        self.assertEqual(6, Invitation.objects.all().count())
+        self.assertEqual(7, len(mail.outbox))
+
+    def test_invite_form_clean_emails(self):
+        form = OrgCRUDL.ManageAccounts.InviteForm(data={"emails": " A@x.com , b@y.com ,", "user_group": "E"})
+        self.assertTrue(form.is_valid(), form.errors)
+        self.assertEqual("a@x.com,b@y.com", form.cleaned_data["emails"])
+
     def test_join(self):
         editor_invitation = Invitation.objects.create(
             org=self.org, user_group="E", email="norkans7@gmail.com", created_by=self.admin, modified_by=self.admin