diff --git a/src/activitypub.rs b/src/activitypub.rs
index 8534fd1..5002eec 100644
--- a/src/activitypub.rs
+++ b/src/activitypub.rs
@@ -11,6 +11,7 @@ pub struct Actor {
     pub name: Option<String>,
     pub icon: Option<Media>,
     pub inbox: String,
+    pub outbox: String,
     #[serde(rename = "publicKey")]
     pub public_key: ActorPublicKey,
     #[serde(rename = "preferredUsername")]
diff --git a/src/actor.rs b/src/actor.rs
index 9a759f2..edbe21c 100644
--- a/src/actor.rs
+++ b/src/actor.rs
@@ -56,6 +56,7 @@ impl Actor {
                 url: "https://fedi.buzz/assets/favicon48.png".to_string(),
             }),
             inbox: self.uri(),
+            outbox: format!("https://{}/outbox", self.host),
             public_key: activitypub::ActorPublicKey {
                 id: self.key_id(),
                 owner: Some(self.uri()),
diff --git a/src/main.rs b/src/main.rs
index b0f590a..b133a37 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -248,6 +248,17 @@ async fn post_relay(
     }
 }
 
+/// An empty ActivityStreams outbox just to satisfy the spec
+async fn outbox() -> Response {
+    Json(json!({
+        "@context": "https://www.w3.org/ns/activitystreams",
+        "summary": "buzzrelay stub outbox",
+        "type": "OrderedCollection",
+        "totalItems": 0,
+        "orderedItems": []
+    })).into_response()
+}
+
 async fn nodeinfo(axum::extract::State(state): axum::extract::State<State>) -> Response {
     let follows_count = state.database.get_follows_count()
         .await
@@ -339,6 +350,7 @@ async fn main() {
     let app = Router::new()
         .route("/tag/:tag", get(get_tag_actor).post(post_tag_relay))
         .route("/instance/:instance", get(get_instance_actor).post(post_instance_relay))
+        .route("/outbox", get(outbox))
         .route("/.well-known/webfinger", get(webfinger))
         .route("/.well-known/nodeinfo", get(nodeinfo))
         .route("/metrics", get(|| async move {