How to properly set up nginx for iredmail along with an existing site?

Question

Nginx

You need to get a working web (done) and a mail server (works, except for the web interface)
I installed iredmail (a kit for deploying a mail server) on a clean ubuntu, created a service address, and then transferred the web server configuration (nginx, php, mysql) - set up and it works, but I can't match the iredmail settings for nginx with the existing web server configuration.
It is necessary to display domain.ru/iredmail and domain.ru/postfixadmin, but something doesn’t work for me.
Tell me how can this be done?