receive_from_subscribed_emailaddresses_only: make From: check case-insensitive

Hello,

I have a few list using schleuder and in lists where i'm not using pgp to verify if someone is on list i use Receive from subscribed emailaddresses only? and there is a problem because this check is case-sensitive i know that this is weak check because You can change From header and send emails to list but this is only what i have. I cannot use verify using pgp sign because peoples don't know how to use it. Do You planing to change it or if it fixed tell me in witch version?

I'm using schleuder version 3.4.0-2 installed from repo on debian10.

Best regards Matthew