I really enjoy the new newsletter menu! A neat feature for this would be the ability to turn those newsletters into RSS feeds, so I can then easily read my newsletters in my favourite RSS reader.

This is my idea how that could be implemented:
There's a button to generate a dedicated alias that I can use to subscribe to a newsletter (similar to aliases for generating log in details in Proton Pass). Instead of landing in my inbox, the mails arrive in the feed. As soon as that alias was generated I also get a link that I can easily paste into my RSS reader.

That feature would not just de-clutter my inbox, but also creates more flexible ways to read and manage newsletters.