improve mail sending error management

biz/admin.py

@@ -361,9 +361,12 @@ class ProspectAdmin(SyncedObjectAdmin):
             if form.is_valid():
                 email_template = form.cleaned_data['email_template']
 
-                self.process_selected_items_with_template(request, queryset, email_template)
+                sent_count, failed_count = self.process_selected_items_with_template(request, queryset, email_template)
 
-                self.message_user(request, f"Email sent to {queryset.count()} prospects using the '{email_template.name}' template.", messages.SUCCESS)
+                if failed_count > 0:
+                    self.message_user(request, f"Email sent to {sent_count} prospects, {failed_count} failed using the '{email_template.name}' template.", messages.WARNING)
+                else:
+                    self.message_user(request, f"Email sent to {sent_count} prospects using the '{email_template.name}' template.", messages.SUCCESS)
                 return HttpResponseRedirect(request.get_full_path())
         else:
             form = EmailTemplateSelectionForm()
@@ -398,9 +401,15 @@ class ProspectAdmin(SyncedObjectAdmin):
                 sent_count += 1
             except Exception as e:
                 error_emails.append(prospect.email)
+                logger.error(f'Failed to send email to {prospect.email}: {str(e)}')
 
             time.sleep(1)
 
+        if error_emails:
+            logger.error(f'Failed to send emails to: {error_emails}')
+
+        return sent_count, len(error_emails)
+
 @admin.register(ProspectGroup)
 class ProspectGroupAdmin(SyncedObjectAdmin):
     list_display = ('name', 'user_count')