Hi,
I have a small problem with PiHole.
When I set PiHole as the primary DNS for my network, emails take a long time to download and load in the iPhone Mail app.
I have PiHole as an LXC container on Proxmox installed by a script from Proxmox VE Helper-Scripts
This is a basic configuration and I have added one list for now:
https://raw.githubusercontent.com/StevenBlack/hosts/master/hosts
When I disable this list or change the DNS to 1.1.1.1, I do not have this problem with emails.
If you need more information, please let me know