diff --git a/pkg/miniauth/miniauth.go b/pkg/miniauth/miniauth.go
index f961d07..54b26ea 100644
--- a/pkg/miniauth/miniauth.go
+++ b/pkg/miniauth/miniauth.go
@@ -65,6 +65,8 @@ func (m Miniauth) RegisterUser(username string, email string, password string) e
 
 	err = m.smtp.SendMail("register", email, map[string]any{"hash": "abc"})
 	if err != nil {
+		m.store.MailRemove(email)
+		m.store.UserDelete(username)
 		return utils.WrapError(ErrCantSendMail, err, log)
 	}
 
diff --git a/pkg/miniauth/miniauth_test.go b/pkg/miniauth/miniauth_test.go
index 3c79660..024ae29 100644
--- a/pkg/miniauth/miniauth_test.go
+++ b/pkg/miniauth/miniauth_test.go
@@ -169,6 +169,20 @@ func TestInvalideUsernames(t *testing.T) {
 	}
 }
 
+func TestUserAndMailIsDeletedIfMailCantBeSend(t *testing.T) {
+	ma := getMiniAuth(t)
+	err := ma.RegisterUser("kekskurse", "error@error.error", "GM18slErbHpuGl7M$!!DD9ZayQzzMWwxqEuTfzJ%XEMjf")
+	assert.ErrorIs(t, err, ErrCantSendMail, "should not be abeld to create user")
+
+	res, err := ma.store.MailCheckExists("error@error.error")
+	assert.Nil(t, err)
+	assert.False(t, res, "should not found mail")
+
+	res, err = ma.store.UserExists("kekskurse")
+	assert.Nil(t, err)
+	assert.False(t, res, "should not found user")
+}
+
 func getMiniAuth(t *testing.T) Miniauth {
 	us, err := userstore.NewDummyStore()
 	assert.Nil(t, err, "[setup] should be abel to creat dummy store")
diff --git a/pkg/userstore/migrations/1741770848_init.up.sql b/pkg/userstore/migrations/1741770848_init.up.sql
index 98f773c..24fd078 100644
--- a/pkg/userstore/migrations/1741770848_init.up.sql
+++ b/pkg/userstore/migrations/1741770848_init.up.sql
@@ -20,3 +20,4 @@ CREATE TABLE mail (
   FOREIGN KEY(user_id) REFERENCES users(id)
 );
 
+PRAGMA foreign_keys = ON;
diff --git a/pkg/userstore/store.go b/pkg/userstore/store.go
index fbfc2a4..e13d4f2 100644
--- a/pkg/userstore/store.go
+++ b/pkg/userstore/store.go
@@ -48,6 +48,11 @@ func NewStore(c Config) (Store, error) {
 		log: log,
 	}
 
+	_, err = s.db.Exec("PRAGMA foreign_keys = ON;")
+	if err != nil {
+		return Store{}, err
+	}
+
 	return s, nil
 }
 
@@ -59,6 +64,7 @@ func NewDummyStore() (Store, error) {
 
 	c := Config{}
 	c.SQLite.Path = fmt.Sprintf("file://%v/%v.sqlite", name, uuid.NewString())
+	fmt.Println(c.SQLite.Path)
 
 	store, err := NewStore(c)
 	if err != nil {
@@ -71,5 +77,10 @@ func NewDummyStore() (Store, error) {
 		return Store{}, err
 	}
 
+	_, err = store.db.Exec("PRAGMA foreign_keys = ON;")
+	if err != nil {
+		return Store{}, err
+	}
+
 	return store, nil
 }
diff --git a/pkg/userstore/users_test.go b/pkg/userstore/users_test.go
index 8e4c15f..b445c63 100644
--- a/pkg/userstore/users_test.go
+++ b/pkg/userstore/users_test.go
@@ -119,6 +119,7 @@ func TestUserRemoveFaildMailExists(t *testing.T) {
 	assert.Nil(t, err, "[setup] should be abel to create user2")
 
 	err = store.MailAdd("foo@example.com", id, true)
+	assert.Nil(t, err, "[setup] should be abel to create mail for user2")
 
 	var count int
 	err = store.db.QueryRow("SELECT COUNT(*) FROM users").Scan(&count)
@@ -126,9 +127,10 @@ func TestUserRemoveFaildMailExists(t *testing.T) {
 	assert.Equal(t, 2, count, "should found 2 users")
 
 	err = store.UserDelete("kekskurse2")
-	assert.Nil(t, err, "should be abel to delete user without error")
+	assert.NotNil(t, err)
+	assert.Equal(t, "cant execute query: constraint failed: FOREIGN KEY constraint failed (787)", err.Error())
 
 	err = store.db.QueryRow("SELECT COUNT(*) FROM users").Scan(&count)
 	assert.Nil(t, err, "should be abel to get user count without error")
-	assert.Equal(t, 1, count, "should found 2 users")
+	assert.Equal(t, 2, count, "should found 2 users")
 }