@@ -34,3 +34,9 @@ class UserAlreadyExists(Exception):
 class DomainNotFound(Exception):
     def __str__(self):
         return _('Domain not found')
+
+
+class EmailSendFailed(Exception):
+    def __str__(self):
+        return _('Failed to send the email. Verify that the email exists and is available')
+
@@ -14,7 +14,7 @@ from django.utils.safestring import SafeString
 from django.utils.translation import gettext_lazy as _
 
 from authentication.exceptions.email_exceptions import LetterNotFound, LetterUnknownException
-from authentication.exceptions.user import DomainNotFound
+from authentication.exceptions.user import DomainNotFound, EmailSendFailed
 from authentication.models import BusinessAccount, BusinessUserHost
 from authentication.models.user import CustomUserModel
 from authentication.services.email_token_service import EmailTokenService
@@ -50,6 +50,8 @@ class EmailService:
             raise DomainNotFound
         except smtplib.SMTPRecipientsRefused:
             raise DomainNotFound
+        except smtplib.SMTPDataError:
+            raise EmailSendFailed
         except Exception as exc:
             logger.exception(exc)
             raise Exception(_('Error occured when proceed email sending'))
@@ -46,6 +46,7 @@ from authentication.exceptions.email_token import EmailTokenNotFound
 from authentication.exceptions.user import (
     DomainNotFound,
     EmailNotConfirmed,
+    EmailSendFailed,
     PasswordsDoNotMatch,
     UserAlreadyExists,
     WrongEmail,
@@ -236,6 +237,8 @@ class UserAPIView(APIView):
             return Response({'detail': f'{exc}'}, status=status.HTTP_400_BAD_REQUEST)
         except DomainNotFound:
             return Response({'detail': _('Email not found')}, status=status.HTTP_400_BAD_REQUEST)
+        except EmailSendFailed as exc:
+            return Response({'detail': f'{exc}'}, status=status.HTTP_400_BAD_REQUEST)
         except Exception as exc:
             logger.exception(exc)
             return Response(
@@ -315,7 +318,9 @@ class BusinessHostAPIView(APIView):
         except AdminCreateForbidden as err:
             return Response({'detail': str(err)}, status=status.HTTP_403_FORBIDDEN)
         except DomainNotFound:
-            return Response({'detail': _('Email sending error: email not found')}, status=status.HTTP_400_BAD_REQUEST)
+            return Response(
+                {'detail': _('Email sending error: email not found')}, status=status.HTTP_400_BAD_REQUEST
+            )
         except Exception as err:
             return Response({'detail': f'{err}'}, status=status.HTTP_400_BAD_REQUEST)
 
@@ -361,13 +366,14 @@ class ReinviteBusinessAccountAPIView(APIView):
         """Reinvite business account including generation of a new password"""
         try:
             business_account = BusinessAccountSelector.filter_by_email(
-                email,
-                BusinessAccountService.get_company_name(request.user)
+                email, BusinessAccountService.get_company_name(request.user)
             )
             BusinessHostService(request.user).reinvite_business_account(business_account=business_account)
             return Response({'detail': _('Business account has been reinvited')}, status=status.HTTP_200_OK)
         except DomainNotFound:
-            return Response({'detail': _('Email sending error: email not found')}, status=status.HTTP_400_BAD_REQUEST)
+            return Response(
+                {'detail': _('Email sending error: email not found')}, status=status.HTTP_400_BAD_REQUEST
+            )
         except LetterNotFound as exc:
             return Response({'detail': f'{exc}'}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)
         except LetterUnknownException as exc:
@@ -433,11 +439,15 @@ class ChangeBusinessAccountPassAPIView(APIView):
                 BusinessAccountService.get_company_name(self.request.user),
             )
             if not business_account:
-                return Response({'detail': _('Business account not found')}, status=status.HTTP_400_BAD_REQUEST)
+                return Response(
+                    {'detail': _('Business account not found')}, status=status.HTTP_400_BAD_REQUEST
+                )
             BusinessAccountService(business_account).update_user_password(
                 request.user, data['password_1'], data['password_2']
             )
-            return Response({'detail': _('Business account password has been updated')}, status=status.HTTP_200_OK)
+            return Response(
+                {'detail': _('Business account password has been updated')}, status=status.HTTP_200_OK
+            )
         except (UnconfirmedUserChangePass, PasswordsDoNotMatch, AdminPasswordChangeForbidden) as exc:
             return Response({'detail': str(exc)}, status=status.HTTP_403_FORBIDDEN)
         except Exception as exc:
@@ -647,7 +657,7 @@ class HostInvitationAPIView(APIView):
         request=AccountDataUpdateSerializer,
         responses={200: BusinessAccountDataSerializer},
     )
-    def put(self, request, user_email : str, *args, **kwargs):
+    def put(self, request, user_email: str, *args, **kwargs):
         """Update company sub-user."""
         try:
             serializer = AccountDataUpdateSerializer(data=request.data)
@@ -140,6 +140,10 @@ msgstr "Пользователь уже существует"
 msgid "Domain not found"
 msgstr "Домен не найден"
 
+#: authentication/exceptions/user.py:41
+msgid "Failed to send the email. Verify that the email exists and is available"
+msgstr "Не удалось отправить письмо. Убедитесь, что email существует и доступен"
+
 #: authentication/models/business_account.py:18 payments/models/promocode.py:72
 #: tools/public_api/models.py:34 tools/public_api/services/api_key.py:24
 msgid "Owner"