Configure direct-delivery incoming email for self-hosted sites with Mail-Receiver

Documentation Self-Hosting
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At my wits end on this one, after spending hours. I can’t seem to get past this Launcher error, even though my config file names are all lowercase.

“ERROR: Config name must not contain upper case characters, spaces or special characters. Correct config name and rerun ./launcher.”

while running

./launcher rebuild mail-receiver

or

./launcher bootstrap mail-receiver

or

./launcher start mail-receiver

I can see it here in the launcher codebase

A programming code snippet shows a conditional statement to validate configuration names in a Docker environment. (Captioned by AI)
A programming code snippet shows a conditional statement to validate configuration names in a Docker environment. (Captioned by AI)978×192 6.13 KB

Grrrrrrrrrr – Please help!

Tried everything on the linked post above related to locale, and everything I could find elsewhere.

./launcher rebuild app___ are all working fine!