Location of mail for user root

Hi, anyone knows where is the location of the mail for the root user? I have a sever named name.example.com (under admin user), and example.com for a normal user; example.com has mail but there is no account or alias named root. name.example.com doesn’t have mail. No mail folders under /root, /home/admin, nor any under /var/mail. But, where it is stored? I get one, see it in the logs:

2024-06-25 00:00:01 xxxxxxxx <= [email protected] U=root P=local S=1096

Where that mail goes?

(Off course example.com is not the real domain, and xxxxxxx is not the real mail ID).

I read that, but in my case, no frozen email are; I mean, that log says that mail to [email protected] was delivered (successfully) locally. Where it is?