Several times I get emails from my own domain which is actually not registered, it can also be called a spoof email. Finally I found a solution for this problem, namely by disabling the mail function in the PHP configuration.
Here’s the guide :
Login to Plesk, click Subscriptions – domain name – PHP Settings and scroll down to the Additional configuration directives field, fill it with disable_functions = mail, then click OK.
I also disabled the Sendmail function (applicable in its entirety) :
Login to Plesk, click Tools & Settings – Mail Server Settings – Disable the Allow user and scripts to use Sendmail option and then click OK.
Or if you only want the type of service (Service Plans):
Login to Plesk, click Service Plans – service type name – Mail – Disable the Allow using Sendmail for scripts and users on this subscription option and then click Update & Sync.
Or if you only want the subscription type (Subscription):
Login to Plesk, click Service Plans – Subscriptions – select a domain name – Outgoing Mail Control – Subscription – Change Limit – Disable the Allow using Sendmail for scripts and users on this subscription option and then click OK.
After a few days the email did not appear again. Thank you.