Try to delete kmail first and fail early if that doesn't work

packages/kol.js/src/Client.ts

@@ -270,14 +270,17 @@ export class Client extends (EventEmitter as unknown as new () => TypedEmitter<E
   }
 
   async deleteKmails(ids: number[]) {
-    await this.fetchText("messages.php", {
+    const response = await this.fetchText("messages.php", {
       searchParams: {
         the_action: "delete",
         box: "Inbox",
         ...Object.fromEntries(ids.map((id) => [`sel${id}`, "on"])),
         pwd: true,
       },
     });
+    return response.includes(
+      `<td>${ids.length} message${ids.length === 1 ? "" : "s"} deleted.</td>`,
+    );
   }
 
   async checkKmails() {

packages/oaf/src/greenbox.ts

@@ -7,6 +7,15 @@ import { kolClient } from "./clients/kol.js";
 export async function handleGreenboxKmail(message: KoLMessage) {
   if (message.type !== "kmail") return;
 
+  const deleted = await kolClient.deleteKmails([message.id]);
+
+  if (!deleted) {
+    await discordClient.alert(
+      `Could not delete greenbox message ahead of action ${message.msg}`,
+    );
+    return;
+  }
+
   // Remove spaces - KoL adds weird spaces to long messages.
   const text = message.msg.replace(/ /g, "").slice(9);
 
@@ -18,8 +27,6 @@ export async function handleGreenboxKmail(message: KoLMessage) {
       await update(message.who.id, message.who.name, text);
       break;
   }
-
-  await kolClient.deleteKmails([message.id]);
 }
 
 async function update(