server {
    listen      192.4.1.6:80;

    server_name mail.mydomen.ru;
    if ($http_host !~ "^mail.mydomen.ru$"){
        rewrite ^(.*)$ http://mail.mydomen.ru$1 redirect;
    }
    root /home/wwwmails/mail-mydomen;

    error_log /var/log/nginx/err-mail_mydomen_ru.log;
    access_log /var/log/nginx/access-mail_mydomen_ru.log;

    include /etc/nginx/templates/content.conf;
    include /etc/nginx/templates/letsencrypt.conf;
}