Question
The following notification is received after WordPress site creation in Plesk:
From: "WordPress" <[email protected]>Â
Date: Aug 21, 2017 1:34 AMÂ
Subject: New WordPress SiteÂ
To: <[email protected]>Â
Your new WordPress site has been successfully set up at:Â
https://example.comÂ
You can log in to the administrator account with the following information:Â
Username: userÂ
Password: The password you chose during the install.Â
Log in here:Â https://example.com/wp-login.phpÂ
We hope you enjoy your new site. Thanks!Â
--The WordPress TeamÂ
https://wordpress.org/
Is it possible to change it’s content?
Answer
The notifications are sent via  wp_new_blog_notification
 function, which is a built-in WordPress function.
This is an official description of the function:
Sends an email with wp_mail to the new administrator that the site setup is complete, and provides them with a record of their login credentials.
It is not possible to change it by creating a predefined template for WordPress since each time a new WordPress site is created, the templates are downloaded from wordpress.org and then deployed.
Vote for the new feature in Plesk here:Â https://plesk.uservoice.com/forums/184549-feature-suggestions/suggestions/36021247-modify-the-email-sent-when-a-new-wordpress-site-is
The top-ranked suggestions are likely to be included in the next versions of Plesk.