[tags2k]

Since everyone's giving !opinions, in my C# DDD world you'd ideally be able to:

  _unitOfWork.Begin();

  var users = await _usersRepo.Load(u => u.LastLogin <= whateverDate);
  users.CheckForExpiry();

  _unitOfWork.Commit();

That then writes the "send expiry email" commands from the aggregate, to an outbox, which a worker then picks up to send. Simple, transactional domain logic.