There are tools like rss bridge that can be a big help: https://github.com/RSS-Bridge/rss-bridge

YouTube wise I use invidious rewrite rules

I’m kind of addicted to miniflux.

I use it to aggregate my RSS l, GitHub release notes, & YouTube feeds so I can stay up to date

From what I understand nexcloud isn’t a mail server, only a client. I’d need something that can act as an SMTP bridge to actually send emails.

Don’t you need the JRE to run Java code?