diff --git a/.github/workflows/end-to-end.yml b/.github/workflows/end-to-end.yml
index 9223527c..e582015c 100644
--- a/.github/workflows/end-to-end.yml
+++ b/.github/workflows/end-to-end.yml
@@ -24,7 +24,7 @@ env:
   DO_NOT_USE_ANNUAIRE_EMAILS: "True"
   DO_NOT_AUTHENTICATE_BROWSER: "True"
   SESSION_COOKIE_SECRET: secret
-  DEBOUNCE_API_KEY:
+  DEBOUNCE_API_KEY: ${{ secrets.DEBOUNCE_API_KEY }}
   SENTRY_DSN:
   INSEE_CONSUMER_KEY: ${{ secrets.INSEE_CONSUMER_KEY }}
   INSEE_CONSUMER_SECRET: ${{ secrets.INSEE_CONSUMER_SECRET }}
@@ -62,6 +62,7 @@ jobs:
           - set_info_after_account_provisioning
           - signin_with_totp
           - reauthenticate_on_admin_page
+          - check_email_deliverability
     runs-on: ubuntu-22.04
     services:
       moncomptepro-standard-client:
diff --git a/cypress/README.md b/cypress/README.md
index 4cd79749..1a2c75fa 100644
--- a/cypress/README.md
+++ b/cypress/README.md
@@ -12,7 +12,7 @@ The script will error out if it doesn’t find the necessary env vars. Ask a tea
 
 ### Setup env vars
 
-You will need to set `BREVO_API_KEY`, `ZAMMAD_URL` and `ZAMMAD_TOKEN`.
+You will need to set `BREVO_API_KEY`, `DEBOUNCE_API_KEY`, `ZAMMAD_URL` and `ZAMMAD_TOKEN`.
 
 Ask a teammate for them and put the values in your `.env`.
 
diff --git a/cypress/e2e/check_email_deliverability.cy.js b/cypress/e2e/check_email_deliverability.cy.js
new file mode 100644
index 00000000..0c2ec97b
--- /dev/null
+++ b/cypress/e2e/check_email_deliverability.cy.js
@@ -0,0 +1,20 @@
+describe("should suggest valid email address", () => {
+  it("should sign-in", function () {
+    cy.visit(`http://localhost:4001`);
+    cy.get("button.moncomptepro-button").click();
+
+    cy.get('[name="login"]').should("have.value", "unused1@yopmail.com");
+    cy.contains("Adresse email invalide.");
+
+    cy.get('[name="login"]').type("{selectall}{del}unused2@yopmail.com");
+    cy.get('[action="/users/start-sign-in"]  [type="submit"]').click();
+
+    cy.get('[name="login"]').should("have.value", "unused2@yopmail.com");
+    cy.contains("Adresse email invalide.");
+
+    cy.get("#did-you-mean-link").click();
+    cy.get('[action="/users/start-sign-in"]  [type="submit"]').click();
+
+    cy.contains("Choisir votre mot de passe");
+  });
+});
diff --git a/cypress/env/check_email_deliverability.conf b/cypress/env/check_email_deliverability.conf
new file mode 100644
index 00000000..ca6eab46
--- /dev/null
+++ b/cypress/env/check_email_deliverability.conf
@@ -0,0 +1 @@
+DO_NOT_CHECK_EMAIL_DELIVERABILITY=False
diff --git a/cypress/fixtures/check_email_deliverability.sql b/cypress/fixtures/check_email_deliverability.sql
new file mode 100644
index 00000000..3ab1edfb
--- /dev/null
+++ b/cypress/fixtures/check_email_deliverability.sql
@@ -0,0 +1,18 @@
+INSERT INTO oidc_clients
+  (client_name, client_id, client_secret, redirect_uris,
+   post_logout_redirect_uris, scope, client_uri, client_description,
+   userinfo_signed_response_alg, id_token_signed_response_alg,
+   authorization_signed_response_alg, introspection_signed_response_alg)
+VALUES
+  (
+    'AgentConnect',
+    'agentconnect_client_id',
+    'agentconnect_client_secret',
+    ARRAY [
+      'http://localhost:4001/login-callback'
+      ],
+    ARRAY []::varchar[],
+    'openid uid given_name usual_name email phone siret is_service_public is_public_service',
+    'http://localhost:4001/',
+    'Dispositif d’identification des agents de la fonction publique.',
+    'ES256', 'ES256', 'ES256', 'ES256');
diff --git a/src/controllers/interaction.ts b/src/controllers/interaction.ts
index 40e8a66c..e7e74296 100644
--- a/src/controllers/interaction.ts
+++ b/src/controllers/interaction.ts
@@ -41,7 +41,6 @@ export const interactionStartControllerFactory =
 
       if (prompt.name === "login" || prompt.name === "choose_organization") {
         if (login_hint) {
-          setEmailInUnauthenticatedSession(req, login_hint);
           req.body.login = login_hint;
           return postStartSignInController(req, res, next);
         }
diff --git a/src/controllers/user/signin-signup.ts b/src/controllers/user/signin-signup.ts
index 75758c12..d60cbd33 100644
--- a/src/controllers/user/signin-signup.ts
+++ b/src/controllers/user/signin-signup.ts
@@ -22,6 +22,7 @@ import * as Sentry from "@sentry/node";
 import { DISPLAY_TEST_ENV_WARNING } from "../../config/env";
 import {
   getEmailFromUnauthenticatedSession,
+  setEmailInUnauthenticatedSession,
   setPartialUserFromUnauthenticatedSession,
   updatePartialUserFromUnauthenticatedSession,
 } from "../../managers/session/unauthenticated";
@@ -95,15 +96,15 @@ export const postStartSignInController = async (
         ? `&did_you_mean=${error.didYouMean}`
         : "";
 
+      setEmailInUnauthenticatedSession(req, req.body.login);
       return res.redirect(
-        `/users/start-sign-in?notification=invalid_email&login_hint=${req.body.login}${didYouMeanQueryParam}`,
+        `/users/start-sign-in?notification=invalid_email${didYouMeanQueryParam}`,
       );
     }
 
     if (error instanceof ZodError) {
-      return res.redirect(
-        `/users/start-sign-in?notification=invalid_email&login_hint=${req.body.login}`,
-      );
+      setEmailInUnauthenticatedSession(req, req.body.login);
+      return res.redirect(`/users/start-sign-in?notification=invalid_email`);
     }
 
     next(error);