diff --git a/src/handlers/editHandler.ts b/src/handlers/editHandler.ts
index 2496ede..2189eae 100644
--- a/src/handlers/editHandler.ts
+++ b/src/handlers/editHandler.ts
@@ -7,17 +7,14 @@ import {
   UNIT_GROUP,
   ADMIN_MAIL,
 } from "../config";
+import { notifySuperior } from "./formHandler";
 
 export function onEdit({
   user,
   value,
   range,
 }: GoogleAppsScript.Events.SheetsOnEdit) {
-  if (value != "Zatwierdzono") {
-    return;
-  }
-
-  console.info("[onEdit] Processing edit event 'Zatwierdzono'");
+  console.info(`[onEdit] Processing edit event, value: ${value}`);
 
   const column = range.getColumn();
   const row = range.getRow();
@@ -30,6 +27,33 @@ export function onEdit({
     return;
   }
 
+  if (value === "Oczekiwanie na opiekuna") {
+    const sheet = getSheet();
+    const data = getRow(sheet, row);
+    if (data.troupName) {
+      notifySuperior(
+        data.superiorEmail,
+        data.troupName,
+        "",
+        data.primaryEmail
+      );
+    } else {
+      notifySuperior(
+        data.superiorEmail,
+        data.name,
+        data.surname,
+        data.primaryEmail
+      );
+    }
+    return;
+  }
+
+  if (value != "Zatwierdzono") {
+    return;
+  }
+
+  console.info("[onEdit] Processing edit event 'Zatwierdzono'");
+
   const sheet = getSheet();
   const userToCreate = getRow(sheet, row);
 
diff --git a/src/handlers/formHandler.ts b/src/handlers/formHandler.ts
index 0384bef..a1fd207 100644
--- a/src/handlers/formHandler.ts
+++ b/src/handlers/formHandler.ts
@@ -1,7 +1,8 @@
 import { getSheet, getRow, updateRow } from "../lib/sheet";
 import { proposeEmail } from "../lib/utils";
 import { sendEmail, renderTemplate } from "../lib/utils";
-import { PROXY_URL } from "../config";
+import { PROXY_URL, SURVEY_LINK } from "../config";
+import { userExists } from "../lib/user";
 
 /**
  * Handles the event
@@ -10,14 +11,44 @@ export function onFormSubmit(e: GoogleAppsScript.Events.SheetsOnFormSubmit) {
   console.info("[onFormSubmit] Started handling form submission");
   const row = e.range.getRow();
   const sheet = getSheet();
-  let { name, surname, troupName, superiorEmail, primaryEmail } = getRow(
-    sheet,
-    row
-  );
+  let {
+    name,
+    surname,
+    troupName,
+    superiorEmail,
+    primaryEmail,
+    recoveryEmail,
+  } = getRow(sheet, row);
+
+  if (!troupName) {
+    primaryEmail = `${proposeEmail(name, surname)}@zhr.pl`;
+  }
+
+  if (userExists(primaryEmail)) {
+    console.info(
+      `[onFormSubmit] Email ${primaryEmail} is already taken. Rejecting request.`
+    );
+    const subject = `Wybrany adres ${primaryEmail} jest już zajęty`;
+    const htmlBody = renderTemplate(
+      "emailTaken",
+      { mail: primaryEmail, surveyLink: SURVEY_LINK },
+      subject
+    ).getContent();
+    sendEmail(recoveryEmail, subject, "", {
+      htmlBody,
+    });
+
+    updateRow(sheet, row, {
+      status: "Odmówiono",
+      primaryEmail,
+      isUnit: !!troupName,
+    });
+    return;
+  }
+
   if (troupName) {
     notifySuperior(superiorEmail, troupName, "", primaryEmail);
   } else {
-    primaryEmail = `${proposeEmail(name, surname)}@zhr.pl`;
     notifySuperior(superiorEmail, name, surname, primaryEmail);
   }
   updateRow(sheet, row, {
@@ -31,7 +62,7 @@ export function onFormSubmit(e: GoogleAppsScript.Events.SheetsOnFormSubmit) {
 /**
  * Send email with superior confirmation link
  */
-function notifySuperior(
+export function notifySuperior(
   superiorEmail: string,
   name: string,
   surname: string,
diff --git a/src/lib/user.ts b/src/lib/user.ts
index 77068c2..019ed8d 100644
--- a/src/lib/user.ts
+++ b/src/lib/user.ts
@@ -74,17 +74,30 @@ export function getGoogleUserSafe(
   }
 }
 
-function userExists(mail: string) {
+export function userExists(mail: string) {
+  if (!AdminDirectory) {
+    throw new Error("AdminDirectory is undefined");
+  }
+
   try {
-    if (AdminDirectory && AdminDirectory.Users) {
+    if (AdminDirectory.Users) {
       AdminDirectory.Users.get(mail);
-    } else {
-      throw new Error("AdminDirectory.Users is undefined");
+      return true;
+    }
+  } catch (err) {
+    // User not found, continue to check groups
+  }
+
+  try {
+    if (AdminDirectory.Groups) {
+      AdminDirectory.Groups.get(mail);
+      return true;
     }
   } catch (err) {
-    return false;
+    // Group not found
   }
-  return true;
+
+  return false;
 }
 
 export function createUser(
diff --git a/src/templates/emailTaken.html b/src/templates/emailTaken.html
new file mode 100644
index 0000000..e271f0d
--- /dev/null
+++ b/src/templates/emailTaken.html
@@ -0,0 +1,22 @@
+<div class="header">
+  <h1>
+    Adres
+    <a href="mailto:<?= mail ?>"><?= mail ?></a>
+    jest już zajęty
+  </h1>
+</div>
+<div class="content">
+  <h2>Czuwaj!</h2>
+  <p>
+    Dziękujemy za przesłanie wniosku o założenie konta w domenie zhr.pl. Niestety wybrany przez Ciebie adres
+    <strong><?= mail ?></strong> jest już zajęty przez innego użytkownika lub grupę.
+  </p>
+  <p>
+    Twój wniosek został automatycznie odrzucony. Możesz uzupełnić formularz jeszcze raz lub skontaktować się z administratorem z prośbą o nadanie unikalnego adresu e-mail.
+  </p>
+  <a href="<?= surveyLink ?>" class="button">Założenie skrzynki mailowej @zhr</a>
+  <hr />
+  <p>
+    Jeżeli uważasz, że nastąpiła pomyłka, napisz do nas w odpowiedzi na tego maila.
+  </p>
+</div>