No email confirmation/notification sent for two POs

Summary:

The user has changed ,cancelled and submitted the two POs with no email confirmation / notification received by email- Please help to fix the same urgently as this is very important and critical that buyer receive notifications for all POs to be received by email.

Content (required):

The user has changed and cancelled the two POs with no email confirmation / notification received by email- Please help to fix the same urgently as this is very important and critical that buyer receive notifications for all POs to be received by email.

i did not know why for these two POs the buyer did not receive notification by email.