Is there any RSS reader that is also able to subscribe to newsletters in some way? There are lot of contents that are only provided as newsletters nowadays and I wanted to be able to read my feed and newsletters in the same app, without going into my mail inbox.
You can subscribe to newsletters with any RSS reader nowadays, but it’s a multi step process requiring the use of an external (free) tool.
1. Create a feed on https://kill-the-newsletter.com/. This will also give you a custom email address to send your newsletter to.
2. Subscribe to the newsletter with the custom email address and add the feed you created to your reader.
This setup works very well for me with NetNewsWire though there is friction in the multiple steps. No affiliation with either, just a satisfied user.
I, too, use kill-the-newsletter to convert newsletters to rss and it works amazingly well.
If you want everything in one place, and you're using email already, then it sounds like you want one of the various rss2email projects.
Feed entries then become emails which sit in your inbox/folders alongside your existing [emailed] newsletters.
(I prefer this approach myself, I can filter and search via my mail client, and manage state easily.)
There are projects which generate web feeds for websites that don't have one.
https://github.com/RSS-Bridge/rss-bridge
https://github.com/DIYgod/RSSHub
inoreader has that on some of their pay tiers. i use my own self host freshrss instance and https://kill-the-newsletter.com/ to accomplish the same.
Many can accept forwarded emails and some will offer an email address you can use to subscribe to newsletters. I prefer the former because you can cancel the forward rule if you don't want to continue with a given rss app or service.
Feedly has this. You can generate a unique email address for each newsletter. Pretty sure you'll need pay. I'm on a lifetime sub.
Kill the Newsletter was suggested above, but Newsblur has a built-in support for newsletters.