I need to access Nextcloud Mail app with a subdomain

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I need help on setting my nextcloud server, I settup everything and all things are working good, but I need to set mail.domain.com to reffer the rainloop mail app of nextcloud, I set the apache to do proxy and reverse proxy to rainloop app but nothing works for me, I don’t know how can I do this.

Hi, I have exact this, configured on my system. I set the DNS settings (from mail.domain.com) to point at "http://domain.com/index.php/apps/rainloop/ ". Is this an option for you?