diff --git a/backend/btrixcloud/invites.py b/backend/btrixcloud/invites.py
index 55bd61b8..b3fc6ce9 100644
--- a/backend/btrixcloud/invites.py
+++ b/backend/btrixcloud/invites.py
@@ -3,8 +3,9 @@
 from datetime import datetime
 from enum import IntEnum
 from typing import Optional
-import uuid
 import os
+import urllib.parse
+import uuid
 
 from pydantic import BaseModel, UUID4
 from fastapi import HTTPException
@@ -135,8 +136,12 @@ class InviteOps:
         allow_existing=False,
         headers: dict = None,
     ):
-        """create new invite for user to join, optionally an org.
-        if allow_existing is false, don't allow invites to existing users"""
+        """Invite user to org (if not specified, to default org).
+
+        If allow_existing is false, don't allow invites to existing users.
+
+        :returns: is_new_user (bool), invite token (str)
+        """
         invite_code = uuid.uuid4().hex
 
         if org:
@@ -152,7 +157,8 @@ class InviteOps:
             oid=oid,
             created=datetime.utcnow(),
             role=invite.role if hasattr(invite, "role") else None,
-            email=invite.email,
+            # URL decode email address just in case
+            email=urllib.parse.unquote(invite.email),
             inviterEmail=user.email,
         )
 
diff --git a/backend/test/test_invites.py b/backend/test/test_invites.py
index 7226d84b..52afad61 100644
--- a/backend/test/test_invites.py
+++ b/backend/test/test_invites.py
@@ -1,5 +1,7 @@
 import requests
 
+import pytest
+
 from .conftest import API_PREFIX
 
 
@@ -38,3 +40,75 @@ def test_pending_invites_crawler(crawler_auth_headers, default_org_id):
     # Verify that only superusers can see pending invites
     r = requests.get(f"{API_PREFIX}/users/invites", headers=crawler_auth_headers)
     assert r.status_code == 403
+
+
+@pytest.mark.parametrize(
+    "invite_email, expected_stored_email",
+    [
+        # Standard email
+        ("invite-to-accept@example.com", "invite-to-accept@example.com"),
+        # Email address with comments
+        ("user+comment@example.com", "user+comment@example.com"),
+        # URL encoded email address with comments
+        ("user%2Bcomment-encoded%40example.com", "user+comment-encoded@example.com"),
+        # User email with diacritic characters
+        ("diacritic-tést@example.com", "diacritic-tést@example.com"),
+        # User email with encoded diacritic characters
+        (
+            "diacritic-t%C3%A9st-encoded%40example.com",
+            "diacritic-tést-encoded@example.com",
+        ),
+    ],
+)
+def test_send_and_accept_invite(
+    admin_auth_headers, default_org_id, invite_email, expected_stored_email
+):
+    # Send invite
+    r = requests.post(
+        f"{API_PREFIX}/users/invite",
+        headers=admin_auth_headers,
+        json={"email": invite_email},
+    )
+    assert r.status_code == 200
+    data = r.json()
+    assert data["invited"] == "new_user"
+
+    # Look up token
+    r = requests.get(
+        f"{API_PREFIX}/users/invites",
+        headers=admin_auth_headers,
+    )
+    assert r.status_code == 200
+    data = r.json()
+    invites_matching_email = [
+        invite
+        for invite in data["pending_invites"]
+        if invite["email"] == expected_stored_email
+    ]
+    token = invites_matching_email[0]["id"]
+
+    # Register user
+    # Note: This will accept invitation without needing to call the
+    # accept invite endpoint explicitly due to post-registration hook.
+    r = requests.post(
+        f"{API_PREFIX}/auth/register",
+        headers=admin_auth_headers,
+        json={
+            "name": "accepted",
+            "email": expected_stored_email,
+            "password": "testpw",
+            "inviteToken": token,
+            "newOrg": False,
+        },
+    )
+    assert r.status_code == 201
+
+    # Verify user belongs to org
+    r = requests.get(f"{API_PREFIX}/orgs/{default_org_id}", headers=admin_auth_headers)
+    assert r.status_code == 200
+    data = r.json()
+    users = data["users"]
+    users_with_invited_email = [
+        user for user in users.values() if user["email"] == expected_stored_email
+    ]
+    assert len(users_with_invited_email) == 1
diff --git a/backend/test/test_org.py b/backend/test/test_org.py
index 69a9d560..331a810c 100644
--- a/backend/test/test_org.py
+++ b/backend/test/test_org.py
@@ -1,5 +1,7 @@
 import requests
 
+import pytest
+
 from .conftest import API_PREFIX
 
 
@@ -152,3 +154,80 @@ def test_get_pending_org_invites(
     assert invite["oid"] == non_default_org_id
     assert invite["created"]
     assert invite["role"]
+
+
+@pytest.mark.parametrize(
+    "invite_email, expected_stored_email",
+    [
+        # Standard email
+        ("invite-to-accept-org@example.com", "invite-to-accept-org@example.com"),
+        # Email address with comments
+        ("user+comment-org@example.com", "user+comment-org@example.com"),
+        # URL encoded email address with comments
+        (
+            "user%2Bcomment-encoded-org%40example.com",
+            "user+comment-encoded-org@example.com",
+        ),
+        # User email with diacritic characters
+        ("diacritic-tést-org@example.com", "diacritic-tést-org@example.com"),
+        # User email with encoded diacritic characters
+        (
+            "diacritic-t%C3%A9st-encoded-org%40example.com",
+            "diacritic-tést-encoded-org@example.com",
+        ),
+    ],
+)
+def test_send_and_accept_org_invite(
+    admin_auth_headers, non_default_org_id, invite_email, expected_stored_email
+):
+    # Send invite
+    r = requests.post(
+        f"{API_PREFIX}/orgs/{non_default_org_id}/invite",
+        headers=admin_auth_headers,
+        json={"email": invite_email, "role": 20},
+    )
+    assert r.status_code == 200
+    data = r.json()
+    assert data["invited"] == "new_user"
+
+    # Look up token
+    r = requests.get(
+        f"{API_PREFIX}/orgs/{non_default_org_id}/invites",
+        headers=admin_auth_headers,
+    )
+    assert r.status_code == 200
+    data = r.json()
+    invites_matching_email = [
+        invite
+        for invite in data["pending_invites"]
+        if invite["email"] == expected_stored_email
+    ]
+    token = invites_matching_email[0]["id"]
+
+    # Register user
+    # Note: This will accept invitation without needing to call the
+    # accept invite endpoint explicitly due to post-registration hook.
+    r = requests.post(
+        f"{API_PREFIX}/auth/register",
+        headers=admin_auth_headers,
+        json={
+            "name": "accepted",
+            "email": expected_stored_email,
+            "password": "testpw",
+            "inviteToken": token,
+            "newOrg": False,
+        },
+    )
+    assert r.status_code == 201
+
+    # Verify user belongs to org
+    r = requests.get(
+        f"{API_PREFIX}/orgs/{non_default_org_id}", headers=admin_auth_headers
+    )
+    assert r.status_code == 200
+    data = r.json()
+    users = data["users"]
+    users_with_invited_email = [
+        user for user in users.values() if user["email"] == expected_stored_email
+    ]
+    assert len(users_with_invited_email) == 1