How can I find out on which domain my assembly / archive with the site was installed?

Question

Notifications

I build websites for business topics.
The question is: how can I track on which domain my assembly is placed?
When you change the administrator's email, the mail goes to the new address, nothing is sent to the old administrator's address. I would like to know on which site they put the purchased assembly of the site, and on the same one ...
Thanks in advance for the advice!

Answer 1

Write an arbitrary function with wp_mail(), in which you specify your mail and initialize to some one-time event, for example, on a hookafter_switch_theme