email address blacklisted?

From: ftimmer <ftimmer_at_web.de>
Date: Wed, 13 Aug 2025 08:57:46 UTC
Hello, 

For several weeks now, emails from my email address have not been
published on this list. 

Is my email address ml@ft-c.de or nl@ft-c.de 
or mail server on the blacklist?

Franz