Hi... Is this correct? Dear: xxx We deeply regret to cause problems by the failure to receive emails. Therefore, we want to convey our most sincere apologies. We have initiated an internal investigation to determine what could have caused the problem, and now the problem is solved. By the moment, we are willing to receive the feedback about the e-mail that we sent you a few days ago. We reiterate our sincere apology and we remain at your disposal for any clarification you need. Sincerely,