diff --git a/internal/api/handler/list.go b/internal/api/handler/list.go
index 0732f34..cf025e1 100644
--- a/internal/api/handler/list.go
+++ b/internal/api/handler/list.go
@@ -11,6 +11,7 @@ import (
 
 type ListHandler struct {
 	ListService *domain.ListService
+	UserService *domain.UserService
 }
 
 func NewListHandler(listService *domain.ListService) *ListHandler {
@@ -99,6 +100,7 @@ func (h *ListHandler) GetLists(w http.ResponseWriter, r *http.Request) {
 // @Param payload body request.AddUserToListPayload true "Add user to list payload"
 // @Success 204 {object} nil
 // @Error 400 {object} response.ErrorResponse "failed to decode request body"
+// @Error 500 {object} response.ErrorResponse "failed to find email in system"
 // @Error 500 {object} response.ErrorResponse "failed to add user to list"
 // @Router /lists/user [post]
 func (h *ListHandler) AddUserToList(w http.ResponseWriter, r *http.Request) {
@@ -118,14 +120,21 @@ func (h *ListHandler) AddUserToList(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	err = h.ListService.AddUserToList(ctx, authContext.UserID, payload.ListID, payload.UserID)
+	user, err := h.UserService.GetUserByEmail(ctx, payload.Email)
+	if err != nil {
+		slog.ErrorContext(ctx, "failed to get user by email", slog.Any("error", err))
+		response.Error(ctx, w, http.StatusInternalServerError, "failed to find email in system")
+		return
+	}
+
+	err = h.ListService.AddUserToList(ctx, authContext.UserID, payload.ListID, user.ID)
 	if err != nil {
 		slog.ErrorContext(ctx, "failed to add user to list", slog.Any("error", err))
 		response.Error(ctx, w, http.StatusInternalServerError, "failed to add user to list")
 		return
 	}
 
-	slog.InfoContext(ctx, "added user to list successfully", slog.Any("list_id", payload.ListID), slog.Any("user_id", payload.UserID))
+	slog.InfoContext(ctx, "added user to list successfully", slog.Any("list_id", payload.ListID), slog.Any("email", user.Email))
 	response.Status(ctx, w, http.StatusNoContent)
 }
 
@@ -139,6 +148,7 @@ func (h *ListHandler) AddUserToList(w http.ResponseWriter, r *http.Request) {
 // @Param payload body request.RemoveUserFromListPayload true "Remove user from list payload"
 // @Success 204 {object} nil
 // @Error 400 {object} response.ErrorResponse "failed to decode request body"
+// @Error 500 {object} response.ErrorResponse "failed to find email in system"
 // @Error 500 {object} response.ErrorResponse "failed to remove user from list"
 // @Router /lists/user [delete]
 func (h *ListHandler) RemoveUserFromList(w http.ResponseWriter, r *http.Request) {
@@ -158,14 +168,21 @@ func (h *ListHandler) RemoveUserFromList(w http.ResponseWriter, r *http.Request)
 		return
 	}
 
-	err = h.ListService.RemoveUserFromList(ctx, authContext.UserID, payload.ListID, payload.UserID)
+	user, err := h.UserService.GetUserByEmail(ctx, payload.Email)
+	if err != nil {
+		slog.ErrorContext(ctx, "failed to get user by email", slog.Any("error", err))
+		response.Error(ctx, w, http.StatusInternalServerError, "failed to find email in system")
+		return
+	}
+
+	err = h.ListService.RemoveUserFromList(ctx, authContext.UserID, payload.ListID, user.ID)
 	if err != nil {
 		slog.ErrorContext(ctx, "failed to remove user from list", slog.Any("error", err))
 		response.Error(ctx, w, http.StatusInternalServerError, "failed to remove user from list")
 		return
 	}
 
-	slog.InfoContext(ctx, "removed user from list successfully", slog.Any("list_id", payload.ListID), slog.Any("user_id", payload.UserID))
+	slog.InfoContext(ctx, "removed user from list successfully", slog.Any("list_id", payload.ListID), slog.Any("email", user.Email))
 	response.Status(ctx, w, http.StatusNoContent)
 }
 
diff --git a/internal/api/request/list.go b/internal/api/request/list.go
index d425b44..00ef7ce 100644
--- a/internal/api/request/list.go
+++ b/internal/api/request/list.go
@@ -7,12 +7,12 @@ type CreateListPayload struct {
 
 type AddUserToListPayload struct {
 	ListID string `json:"list_id"`
-	UserID string `json:"user_id"`
+	Email  string `json:"email"`
 }
 
 type RemoveUserFromListPayload struct {
 	ListID string `json:"list_id"`
-	UserID string `json:"user_id"`
+	Email  string `json:"email"`
 }
 
 type CreateListItemPayload struct {
diff --git a/internal/domain/list.go b/internal/domain/list.go
index ba4d21f..7d25f33 100644
--- a/internal/domain/list.go
+++ b/internal/domain/list.go
@@ -78,13 +78,9 @@ func (s *ListService) AddUserToList(ctx context.Context, authUserID string, list
 		return ErrUserIDEmpty
 	}
 
-	inList, err := s.repo.IsUserInList(ctx, listID, authUserID)
-	if err != nil {
+	if err := s.userAllowedToAccessList(ctx, authUserID, listID); err != nil {
 		return err
 	}
-	if !inList {
-		return ErrUserNotInList
-	}
 
 	return s.repo.AddUserToList(ctx, listID, userID)
 }
diff --git a/internal/domain/user.go b/internal/domain/user.go
index f7ebad4..4f57065 100644
--- a/internal/domain/user.go
+++ b/internal/domain/user.go
@@ -17,6 +17,7 @@ type User struct {
 
 type UserRepository interface {
 	CreateUser(ctx context.Context, email string, name string, passwordHash string) (*User, error)
+	GetUserByEmail(ctx context.Context, email string) (*User, error)
 }
 
 type UserService struct {
@@ -45,3 +46,7 @@ func (s *UserService) CreateUser(ctx context.Context, email string, name string,
 
 	return s.repo.CreateUser(ctx, email, name, string(hash))
 }
+
+func (s *UserService) GetUserByEmail(ctx context.Context, email string) (*User, error) {
+	return s.repo.GetUserByEmail(ctx, email)
+}
diff --git a/internal/repository/user.go b/internal/repository/user.go
index 4749def..177a465 100644
--- a/internal/repository/user.go
+++ b/internal/repository/user.go
@@ -39,3 +39,17 @@ func (r *UserRepo) CreateUser(ctx context.Context, email string, name string, pa
 
 	return user, nil
 }
+
+func (r *UserRepo) GetUserByEmail(ctx context.Context, email string) (*domain.User, error) {
+	user := &domain.User{}
+
+	err := r.db.QueryRowContext(ctx,
+		"SELECT id, email, name FROM users WHERE email = $1",
+		email,
+	).Scan(&user.ID, &user.Email, &user.Name)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get user: %w", err)
+	}
+
+	return user, nil
+}