diff --git a/CHANGELOG.md b/CHANGELOG.md
index 51fbff2..cdafe37 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,6 +30,10 @@ and this project adheres to
 
 - 👽️(mailboxes) fix mailbox creation after dimail api improvement (#360)
 
+### Fixed
+
+- 🐛(frontend) user can submit form to add mail domain by pressing "Enter" key
+
 ## [1.0.1] - 2024-08-19
 
 ### Fixed
diff --git a/src/frontend/apps/desk/src/features/mail-domains/components/ModalAddMailDomain.tsx b/src/frontend/apps/desk/src/features/mail-domains/components/ModalAddMailDomain.tsx
index df2b58f..d7f0018 100644
--- a/src/frontend/apps/desk/src/features/mail-domains/components/ModalAddMailDomain.tsx
+++ b/src/frontend/apps/desk/src/features/mail-domains/components/ModalAddMailDomain.tsx
@@ -2,10 +2,16 @@ import { zodResolver } from '@hookform/resolvers/zod';
 import { Button, Input, Loader, ModalSize } from '@openfun/cunningham-react';
 import { useRouter } from 'next/navigation';
 import React from 'react';
-import { Controller, FormProvider, useForm } from 'react-hook-form';
+import {
+  Controller,
+  FormProvider,
+  UseFormReturn,
+  useForm,
+} from 'react-hook-form';
 import { useTranslation } from 'react-i18next';
 import { z } from 'zod';
 
+import { APIError } from '@/api';
 import { Box, Text, TextErrors } from '@/components';
 import { Modal } from '@/components/Modal';
 import { useCreateMailDomain } from '@/features/mail-domains';
@@ -14,7 +20,68 @@ import { default as MailDomainsLogo } from '../assets/mail-domains-logo.svg';
 
 const FORM_ID = 'form-add-mail-domain';
 
-export const ModalCreateMailDomain = () => {
+const useAddMailDomainApiError = ({
+  error,
+  methods,
+}: {
+  error: APIError | null;
+  methods: UseFormReturn<{ name: string }> | null;
+}): string[] | undefined => {
+  const [errorCauses, setErrorCauses] = React.useState<undefined | string[]>(
+    undefined,
+  );
+  const { t } = useTranslation();
+
+  React.useEffect(() => {
+    if (methods && t && error) {
+      let causes = undefined;
+
+      if (error.cause?.length) {
+        const parseCauses = (causes: string[]) =>
+          causes.reduce((arrayCauses, cause) => {
+            switch (cause) {
+              case 'Mail domain with this name already exists.':
+              case 'Mail domain with this Slug already exists.':
+                methods.setError('name', {
+                  type: 'manual',
+                  message: t(
+                    'This mail domain is already used. Please, choose another one.',
+                  ),
+                });
+                break;
+              default:
+                arrayCauses.push(cause);
+            }
+
+            return arrayCauses;
+          }, [] as string[]);
+
+        causes = parseCauses(error.cause);
+      }
+
+      if (error.status === 500 || !error.cause) {
+        causes = [
+          t(
+            'Your request cannot be processed because the server is experiencing an error. If the problem ' +
+              'persists, please contact our support to resolve the issue: suiteterritoriale@anct.gouv.fr.',
+          ),
+        ];
+      }
+
+      setErrorCauses(causes);
+    }
+  }, [methods, t, error]);
+
+  React.useEffect(() => {
+    if (errorCauses && methods) {
+      methods.setFocus('name');
+    }
+  }, [methods, errorCauses]);
+
+  return errorCauses;
+};
+
+export const ModalAddMailDomain = () => {
   const { t } = useTranslation();
   const router = useRouter();
 
@@ -42,28 +109,16 @@ export const ModalCreateMailDomain = () => {
     },
   });
 
-  const onSubmitCallback = () => {
-    void methods.handleSubmit(({ name }, event) => {
-      event?.preventDefault();
+  const errorCauses = useAddMailDomainApiError({ error, methods });
+
+  const onSubmitCallback = (event: React.FormEvent) => {
+    event.preventDefault();
+
+    void methods.handleSubmit(({ name }) => {
       void createMailDomain(name);
     })();
   };
 
-  const causes = error?.cause?.filter((cause) => {
-    const isFound = cause === 'Mail domain with this name already exists.';
-
-    if (isFound) {
-      methods.setError('name', {
-        type: 'manual',
-        message: t(
-          'This mail domain is already used. Please, choose another one.',
-        ),
-      });
-    }
-
-    return !isFound;
-  });
-
   if (!methods) {
     return null;
   }
@@ -82,7 +137,8 @@ export const ModalCreateMailDomain = () => {
       onClose={() => router.push('/mail-domains/')}
       rightActions={
         <Button
-          onClick={onSubmitCallback}
+          type="submit"
+          form={FORM_ID}
           disabled={!methods.watch('name') || isPending}
         >
           {t('Add the domain')}
@@ -98,8 +154,16 @@ export const ModalCreateMailDomain = () => {
         </>
       }
     >
+      {!!errorCauses?.length ? (
+        <TextErrors
+          $margin={{ bottom: 'small' }}
+          $textAlign="left"
+          causes={errorCauses}
+        />
+      ) : null}
+
       <FormProvider {...methods}>
-        <form action="" id={FORM_ID}>
+        <form id={FORM_ID} onSubmit={onSubmitCallback}>
           <Controller
             control={methods.control}
             name="name"
@@ -123,7 +187,6 @@ export const ModalCreateMailDomain = () => {
             )}
           />
         </form>
-        {!!causes?.length ? <TextErrors causes={causes} /> : null}
 
         {isPending && (
           <Box $align="center">
diff --git a/src/frontend/apps/e2e/__tests__/app-desk/mail-domains-add.spec.ts b/src/frontend/apps/e2e/__tests__/app-desk/mail-domains-add.spec.ts
index 4807825..6ef300d 100644
--- a/src/frontend/apps/e2e/__tests__/app-desk/mail-domains-add.spec.ts
+++ b/src/frontend/apps/e2e/__tests__/app-desk/mail-domains-add.spec.ts
@@ -1,7 +1,32 @@
-import { expect, test } from '@playwright/test';
+import { Page, expect, test } from '@playwright/test';
 
 import { keyCloakSignIn, randomName } from './common';
 
+const getElements = (page: Page) => {
+  const panel = page.getByLabel('Mail domains panel').first();
+  const linkIndexPageAddDomain = page.getByRole('link', {
+    name: 'Add a mail domain',
+  });
+  const form = page.locator('form');
+  const inputName = form.getByLabel('Domain name');
+  const buttonSubmit = page.getByRole('button', {
+    name: 'Add the domain',
+  });
+
+  const buttonCancel = page.getByRole('button', {
+    name: 'Cancel',
+  });
+
+  return {
+    panel,
+    linkIndexPageAddDomain,
+    form,
+    inputName,
+    buttonCancel,
+    buttonSubmit,
+  };
+};
+
 test.beforeEach(async ({ page, browserName }) => {
   await page.goto('/');
   await keyCloakSignIn(page, browserName);
@@ -9,16 +34,14 @@ test.beforeEach(async ({ page, browserName }) => {
 
 test.describe('Add Mail Domains', () => {
   test('checks all the elements are visible', async ({ page }) => {
-    await page.goto('/mail-domains');
+    await page.goto('/mail-domains/');
 
-    const buttonFromHomePage = page.getByRole('button', {
-      name: 'Add a mail domain',
-    });
+    const { linkIndexPageAddDomain, inputName } = getElements(page);
 
-    await expect(buttonFromHomePage).toBeVisible();
-    await buttonFromHomePage.click();
+    await expect(linkIndexPageAddDomain).toBeVisible();
+    await linkIndexPageAddDomain.click();
 
-    await expect(buttonFromHomePage).toBeHidden();
+    await expect(linkIndexPageAddDomain).toBeHidden();
 
     await expect(
       page.getByRole('heading', {
@@ -27,9 +50,7 @@ test.describe('Add Mail Domains', () => {
       }),
     ).toBeVisible();
 
-    const form = page.locator('form');
-
-    await expect(form.getByLabel('Domain name')).toBeVisible();
+    await expect(inputName).toBeVisible();
 
     await expect(page.getByText('Example: saint-laurent.fr')).toBeVisible();
 
@@ -46,38 +67,25 @@ test.describe('Add Mail Domains', () => {
   });
 
   test('checks the cancel button interaction', async ({ page }) => {
-    await page.goto('/mail-domains');
+    await page.goto('/mail-domains/');
 
-    const buttonFromHomePage = page.getByRole('button', {
-      name: 'Add a mail domain',
-    });
-    await buttonFromHomePage.click();
+    const { linkIndexPageAddDomain, buttonCancel } = getElements(page);
 
-    await expect(buttonFromHomePage).toBeHidden();
+    await linkIndexPageAddDomain.click();
+    await buttonCancel.click();
 
-    await page
-      .getByRole('button', {
-        name: 'Cancel',
-      })
-      .click();
+    await expect(buttonCancel).toBeHidden();
 
-    await expect(buttonFromHomePage).toBeVisible();
+    await expect(linkIndexPageAddDomain).toBeVisible();
   });
 
   test('checks form invalid status', async ({ page }) => {
-    await page.goto('/mail-domains');
+    await page.goto('/mail-domains/');
 
-    const buttonFromHomePage = page.getByRole('button', {
-      name: 'Add a mail domain',
-    });
-    await buttonFromHomePage.click();
+    const { linkIndexPageAddDomain, inputName, buttonSubmit } =
+      getElements(page);
 
-    const form = page.locator('form');
-
-    const inputName = form.getByLabel('Domain name');
-    const buttonSubmit = page.getByRole('button', {
-      name: 'Add the domain',
-    });
+    await linkIndexPageAddDomain.click();
 
     await expect(inputName).toBeVisible();
     await expect(page.getByText('Example: saint-laurent.fr')).toBeVisible();
@@ -105,18 +113,17 @@ test.describe('Add Mail Domains', () => {
     const mailDomainName = randomName('versailles.fr', browserName, 1)[0];
     const mailDomainSlug = mailDomainName.replace('.', '');
 
-    await page.goto('/mail-domains');
+    await page.goto('/mail-domains/');
 
-    const panel = page.getByLabel('Mail domains panel').first();
+    const { linkIndexPageAddDomain, inputName, buttonSubmit } =
+      getElements(page);
 
-    await panel.getByRole('link', { name: 'Add a mail domain' }).click();
+    await linkIndexPageAddDomain.click();
 
-    const form = page.locator('form');
+    await inputName.fill(mailDomainName);
+    await buttonSubmit.click();
 
-    await form.getByLabel('Domain name').fill(mailDomainName);
-    await page.getByRole('button', { name: 'Add the domain' }).click();
-
-    await expect(page).toHaveURL(`/mail-domains\/${mailDomainSlug}/`);
+    await expect(page).toHaveURL(`/mail-domains/${mailDomainSlug}/`);
 
     await expect(
       page.getByRole('heading', {
@@ -125,41 +132,140 @@ test.describe('Add Mail Domains', () => {
     ).toBeVisible();
   });
 
-  test('checks error when duplicate mail domain', async ({
+  test('checks form submits at "Enter" key press', async ({ page }) => {
+    void page.route('**/api/v1.0/mail-domains/', (route) => {
+      if (route.request().method() === 'POST') {
+        void route.fulfill({
+          json: {
+            id: '2ebcfcfb-1dfa-4ed1-8e4a-554c63307b7c',
+            name: 'enter.fr',
+            slug: 'enterfr',
+            status: 'pending',
+            abilities: {
+              get: true,
+              patch: true,
+              put: true,
+              post: true,
+              delete: true,
+              manage_accesses: true,
+            },
+            created_at: '2024-08-21T10:55:21.081994Z',
+            updated_at: '2024-08-21T10:55:21.082109Z',
+          },
+        });
+      } else {
+        void route.continue();
+      }
+    });
+
+    await page.goto('/mail-domains/');
+
+    const { linkIndexPageAddDomain, inputName } = getElements(page);
+
+    await linkIndexPageAddDomain.click();
+
+    await inputName.fill('enter.fr');
+    await page.keyboard.press('Enter');
+
+    await expect(page).toHaveURL(`/mail-domains/enterfr/`);
+  });
+
+  test('checks error when duplicate mail domain name', async ({
     page,
     browserName,
   }) => {
-    await page.goto('/mail-domains');
+    await page.goto('/mail-domains/');
 
-    const panel = page.getByLabel('Mail domains panel').first();
-    const additionLink = panel.getByRole('link', {
-      name: 'Add a mail domain',
-    });
-    const form = page.locator('form');
-    const inputName = form.getByLabel('Domain name');
-    const submitButton = page.getByRole('button', {
-      name: 'Add the domain',
-    });
+    const { linkIndexPageAddDomain, inputName, buttonSubmit } =
+      getElements(page);
 
     const mailDomainName = randomName('duplicate.fr', browserName, 1)[0];
     const mailDomainSlug = mailDomainName.replace('.', '');
 
-    await additionLink.click();
+    await linkIndexPageAddDomain.click();
     await inputName.fill(mailDomainName);
-    await submitButton.click();
+    await buttonSubmit.click();
 
     await expect(page).toHaveURL(`/mail-domains\/${mailDomainSlug}\/`);
 
-    await additionLink.click();
+    await linkIndexPageAddDomain.click();
 
     await inputName.fill(mailDomainName);
-    await submitButton.click();
+    await buttonSubmit.click();
 
+    await expect(page).toHaveURL(/mail-domains\//);
     await expect(
       page.getByText(
         'This mail domain is already used. Please, choose another one.',
       ),
     ).toBeVisible();
+    await expect(inputName).toBeFocused();
+  });
+
+  test('checks error when duplicate mail domain slug', async ({
+    page,
+    browserName,
+  }) => {
+    await page.goto('/mail-domains/');
+
+    const { linkIndexPageAddDomain, inputName, buttonSubmit } =
+      getElements(page);
+
+    const mailDomainSlug = randomName('duplicate', browserName, 1)[0];
+
+    await linkIndexPageAddDomain.click();
+    await inputName.fill(mailDomainSlug);
+    await buttonSubmit.click();
+
+    await expect(page).toHaveURL(`/mail-domains\/${mailDomainSlug}\/`);
+
+    await linkIndexPageAddDomain.click();
+
+    await inputName.fill(mailDomainSlug);
+    await buttonSubmit.click();
+
+    await expect(page).toHaveURL(/mail-domains\//);
+    await expect(
+      page.getByText(
+        'This mail domain is already used. Please, choose another one.',
+      ),
+    ).toBeVisible();
+    await expect(inputName).toBeFocused();
+  });
+
+  test('checks unknown api error causes are displayed', async ({ page }) => {
+    await page.route(
+      '**/api/v1.0/mail-domains/',
+      async (route) => {
+        if (route.request().method() === 'POST') {
+          await route.fulfill({
+            status: 500,
+            json: {
+              unknown_error: ['Unknown error from server'],
+            },
+          });
+        }
+      },
+      { times: 1 },
+    );
+
+    await page.goto('/mail-domains/');
+
+    const { linkIndexPageAddDomain, inputName, buttonSubmit } =
+      getElements(page);
+
+    await linkIndexPageAddDomain.click();
+    await inputName.fill('server-error.fr');
+    await buttonSubmit.click();
+
+    await expect(page).toHaveURL(/mail-domains\//);
+    await expect(
+      page.getByText(
+        'Your request cannot be processed because the server is experiencing an error. If the problem ' +
+          'persists, please contact our support to resolve the issue: suiteterritoriale@anct.gouv.fr.',
+      ),
+    ).toBeVisible();
+    await expect(inputName).toBeFocused();
   });
 
   test('checks 404 on mail-domains/[slug] page', async ({ page }) => {