It has been observed that at times when an e-mail is sent to 2 or more people in the same organization it is not received by all the people. For e.g. xx is sending mail to x and y, ideally both should receive the mail but only one of them receives. As a result x is aware that the mail has been sent to y also but not y due to non-receipt of mail sent by xx. This issue needs to be sorted out on priority.