If Send Email step fails, it will be showed as failed step in Operator.
Is the issue with all emails or specific to one package/scenario ?
Thanks, all the emails can not receive when run load plan fails
Check Operator log, for the step that was supposed to send email.
If that step failed, check the error.
In order to check if the emails sent out successfully or they failed, open your ODI 188.8.131.52.0 Studio > Operator Navigator
See image below as a reference to know where is the Operator Navigator located in ODI Studio: