The invalid email address was generated by the Project Template. The Project Template has a participant at team tab that is copied to the new projects.
The user who open the new project received the participant with invalid email address.
 

Ex:
This is the mail system at host antlia.tjba.jus.br.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<[email protected]>: Host or domain name not found. Name service error for
    name=xog.localdomain type=A: Host not found

CA PPM 15.2 - Ondemand

There are 2 options to solve this issue:

1. Fix the email address of the participant accessing the resource profile.
2. Remove the user participant from project template at the participant team tab.