diff --git a/app/user/rest.py b/app/user/rest.py
index 87e9cf305..b4011ebe7 100644
--- a/app/user/rest.py
+++ b/app/user/rest.py
@@ -196,7 +196,7 @@ def send_user_email_code(user_to_send_to, data):
     secret_code = str(uuid.uuid4())
     personalisation = {
         'name': user_to_send_to.name,
-        'url': _create_2fa_url(user_to_send_to, secret_code, data.get('next'))
+        'url': _create_2fa_url(user_to_send_to, secret_code, data.get('next'), data.get('email_auth_link_host'))
     }
 
     create_2fa_code(
@@ -413,10 +413,10 @@ def _create_confirmation_url(user, email_address):
     return url_with_token(data, url, current_app.config)
 
 
-def _create_2fa_url(user, secret_code, next_redir):
+def _create_2fa_url(user, secret_code, next_redir, email_auth_link_host):
     data = json.dumps({'user_id': str(user.id), 'secret_code': secret_code})
     url = '/email-auth/'
-    ret = url_with_token(data, url, current_app.config)
+    ret = url_with_token(data, url, current_app.config, base_url=email_auth_link_host)
     if next_redir:
         ret += '?{}'.format(urlencode({'next': next_redir}))
     return ret
diff --git a/app/user/users_schema.py b/app/user/users_schema.py
index 4f4b27f8c..cc8bb1040 100644
--- a/app/user/users_schema.py
+++ b/app/user/users_schema.py
@@ -22,6 +22,7 @@ post_send_user_email_code_schema = {
         # doesn't need 'to' as we'll just grab user.email_address. but lets keep it
         # as allowed to keep admin code cleaner, but only as null to prevent confusion
         'to': {'type': 'null'},
+        'email_auth_link_host': {'type': ['string', 'null']},
         'next': {'type': ['string', 'null']},
     },
     'required': [],
diff --git a/app/utils.py b/app/utils.py
index 49f6d61dc..b1367cc7d 100644
--- a/app/utils.py
+++ b/app/utils.py
@@ -20,10 +20,10 @@ def pagination_links(pagination, endpoint, **kwargs):
     return links
 
 
-def url_with_token(data, url, config):
+def url_with_token(data, url, config, base_url=None):
     from notifications_utils.url_safe_token import generate_token
     token = generate_token(data, config['SECRET_KEY'], config['DANGEROUS_SALT'])
-    base_url = config['ADMIN_BASE_URL'] + url
+    base_url = (base_url or config['ADMIN_BASE_URL']) + url
     return base_url + token
 
 
diff --git a/tests/app/user/test_rest_verify.py b/tests/app/user/test_rest_verify.py
index c43507784..b97f4ef81 100644
--- a/tests/app/user/test_rest_verify.py
+++ b/tests/app/user/test_rest_verify.py
@@ -343,12 +343,30 @@ def test_reset_failed_login_count_returns_404_when_user_does_not_exist(client):
     assert resp.status_code == 404
 
 
-def test_send_user_email_code(admin_request, mocker, sample_user, email_2fa_code_template):
+@pytest.mark.parametrize('data, expected_auth_url', (
+    (
+        {},
+        'http://localhost:6012/email-auth/.',
+    ),
+    (
+        {'to': None},
+        'http://localhost:6012/email-auth/.',
+    ),
+    (
+        {'to': None, 'email_auth_link_host': 'https://example.com'},
+        'https://example.com/email-auth/.',
+    ),
+))
+def test_send_user_email_code(
+    admin_request,
+    mocker,
+    sample_user,
+    email_2fa_code_template,
+    data,
+    expected_auth_url,
+):
     deliver_email = mocker.patch('app.celery.provider_tasks.deliver_email.apply_async')
 
-    data = {
-        'to': None
-    }
     admin_request.post(
         'user.send_user_2fa_code',
         code_type='email',
@@ -361,6 +379,7 @@ def test_send_user_email_code(admin_request, mocker, sample_user, email_2fa_code
     assert noti.to == sample_user.email_address
     assert str(noti.template_id) == current_app.config['EMAIL_2FA_TEMPLATE_ID']
     assert noti.personalisation['name'] == 'Test User'
+    assert noti.personalisation['url'].startswith(expected_auth_url)
     deliver_email.assert_called_once_with(
         [str(noti.id)],
         queue='notify-internal-tasks'