Multiple config.php files - How it's supposed to work?

[Vincent_Stans]

Did you know anysetting.config.php

The settings in the custom files take priority over the ones in config.php. You can either remove the no longer used bits from your config.php (the mail settings in your case) or leave them and they’ll be overwritten by whatever you have in mail.config.php. The docs linked to explain it: Nextcloud supports loading configuration parameters from multiple files. You can add arbitrary files ending with .config.php in the config/ directory, for example you could place your email server configurati…