newsmail.today is the best feed aggregator you'll ever use. Receive digests for your subscriptions.
So that you can read them distraction-free, and retain a copy.
One e-mail per article
So that you can forward, delete, categorise, and mark each article separately.
Hourly, daily, or weekly
So that you can receive them when you wish, not the other way around.
E-mail is free, open, and has been around for 46 years.
You can already search your e-mails and categorise them as you wish, and to share an article, simply forward it.
E-mail has solved the delivery problem long ago.
It's easier for you to use, and cheaper for us to deliver so we can both focus on what matters: the content.
Half-life of a web-page is around two years. 
Having a full-text copy of every article you've read in your mailbox leaves nothing to worry about.
All e-mail clients allows you to read your e-mails offline.
So you can enjoy your favourite columnist on the underground, or at the airport.