@[deleted] you can delete the logos this way:
Get the Redis database password:
cd /opt/mailcow-dockerized
grep REDISPASS mailcow.conf
Login to the Redis container:
docker compose exec redis-mailcow redis-cli
Authenticate to Redis with the password from above and set empty keys:
127.0.0.1:6379> AUTH **** <--- PASSWORD FROM ABOVE
OK
127.0.0.1:6379> set MAIN_LOGO ""
OK
127.0.0.1:6379> set MAIN_LOGO_DARK ""
OK
After this, the logos will be reset to the mailcow default
Kudos to @ETNyx