Adpatch : notified by email feature not sending notification

VPC Team member opened this thread for the customer.

Release 12.1.3

I am trying to apply "adpatch" using notification feature as below , But adpatch not sending me email:

You can be notified by email if a failure occurs.
Do you wish to activate this feature [No] ? Yes

You chose to be notified by email when a failure occurs.
Please enter the email id(s) (separated by a space) that notifications should be
sent to [applmgr] : user@<server>.<domain>
==================

This is four your information my mail is working fine where I am running adpatch to apply patch.
If i use following command on my server where I am applying adpatch it sending me email