1. In case dmarc is not passed you get extra red banner with warning to forwarded email
2. Yes you get special email to reply-to field that allows sending from alias, but you have to make sure you remove included banner containing alias deactivation URL from quoted part of reply. You can disable this header but in my case I needed to reply only few times
2. Yes you get special email to reply-to field that allows sending from alias, but you have to make sure you remove included banner containing alias deactivation URL from quoted part of reply. You can disable this header but in my case I needed to reply only few times