diff --git a/src/pages/directory/edit.rs b/src/pages/directory/edit.rs
index 5f6ac11..00f7b8f 100644
--- a/src/pages/directory/edit.rs
+++ b/src/pages/directory/edit.rs
@@ -24,7 +24,7 @@ use crate::{
             stacked_badge::StackedBadge,
             stacked_input::StackedInput,
             tab::Tab,
-            Form, FormButtonBar, FormElement, FormItem, FormSection,
+            Form, FormButtonBar, FormElement, FormItem, FormSection, ValidateCb,
         },
         messages::alert::{use_alerts, Alert},
         skeleton::Skeleton,
@@ -840,6 +840,30 @@ pub fn PrincipalEdit() -> impl IntoView {
                                             />
 
                                         </FormItem>
+                                        <FormItem
+                                            label="External Members"
+                                            hide=Signal::derive(move || {
+                                                !matches!(selected_type.get(), PrincipalType::List)
+                                            })
+                                        >
+
+                                            <StackedBadge
+                                                color=Color::Red
+                                                element=FormElement::new("external-members", data)
+                                                add_button_text="Add e-mail".to_string()
+                                                validate_item=Callback::new(move |
+                                                    (value, cb): (String, ValidateCb)|
+                                                {
+                                                    let email = value.trim().to_lowercase();
+                                                    if email.contains('@') && email.contains('.') {
+                                                        cb.call(Ok(email));
+                                                    } else {
+                                                        cb.call(Err("Please enter a valid e-mail".to_string()))
+                                                    }
+                                                })
+                                            />
+
+                                        </FormItem>
                                     </FormSection>
 
                                     <FormSection>
@@ -1094,6 +1118,7 @@ impl FormData {
                 principal.disabled_permissions.as_string_list(),
             ),
             ("urls", principal.urls.as_string_list()),
+            ("external-members", principal.external_members.as_string_list()),
         ] {
             self.array_set(key, list.iter());
         }
@@ -1156,6 +1181,7 @@ impl FormData {
                 ("enabled-permissions", &mut principal.enabled_permissions),
                 ("disabled-permissions", &mut principal.disabled_permissions),
                 ("urls", &mut principal.urls),
+                ("external-members", &mut principal.external_members)
             ] {
                 *list = PrincipalValue::StringList(
                     self.array_value(key).map(|m| m.to_string()).collect(),
@@ -1219,6 +1245,13 @@ impl Builder<Schemas, ()> {
                 [Validator::IsEmail],
             )
             .build()
+            .new_field("external-members")
+            .typ(Type::Array)
+            .input_check(
+                [Transformer::Trim, Transformer::Lowercase],
+                [Validator::IsEmail],
+            )
+            .build()
             .new_field("urls")
             .typ(Type::Array)
             .input_check([Transformer::Trim], [Validator::IsUrl])
diff --git a/src/pages/directory/mod.rs b/src/pages/directory/mod.rs
index 58bb4a2..29cdc09 100644
--- a/src/pages/directory/mod.rs
+++ b/src/pages/directory/mod.rs
@@ -77,6 +77,10 @@ pub struct Principal {
     #[serde(default, skip_serializing_if = "PrincipalValue::is_none")]
     #[serde(rename = "disabledPermissions")]
     pub disabled_permissions: PrincipalValue,
+
+    #[serde(default, skip_serializing_if = "PrincipalValue::is_none")]
+    #[serde(rename = "externalMembers")]
+    pub external_members: PrincipalValue,
 }
 
 #[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
@@ -117,6 +121,7 @@ pub enum PrincipalField {
     DisabledPermissions,
     Picture,
     Urls,
+    ExternalMembers,
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
@@ -240,6 +245,11 @@ impl Principal {
 
         for (field, current, change) in [
             (PrincipalField::Emails, current.emails, changes.emails),
+            (
+                PrincipalField::ExternalMembers,
+                current.external_members,
+                changes.external_members,
+            ),
             (
                 PrincipalField::MemberOf,
                 current.member_of,