Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can. 
The Basics
- Nextcloud Server version (e.g., 29.x.x):
Nextcloud version: 30.0.6 - 30.0.6.2
- Operating system and version (e.g., Ubuntu 24.04):
Ubuntu 24.04
- Web server and version (e.g, Apache 2.4.25):
Apache/2.4.58 (Ubuntu) (fpm-fcgi)
- Reverse proxy and version _(e.g. nginx 1.27.2)
- Nginx Proxy Managerv2.11.3`
- PHP version (e.g, 8.3):
8.3.6
- Is this the first time you’ve seen this error? (Yes / No):
Yas
- When did this problem seem to first start?
today
- Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
guide from https://mailserverguru.com/install-nextcloud-ubuntu-24-04/ in Proxmox VM
- Are you using CloudfIare, mod_security, or similar? (Yes / No)
no
Summary of the issue you are facing:
I Just try to setup my email in Basic Settings and this error occurs. I allready try to setup the SMTP Debug but nothing shows up in the logs.
