Since CISA killed it's RSS feed[1], If anyone is interested, I created an account here that will allow anyone to subscribe both via the fediverse and via RSS using the mastodon RSS feed for that account. The account is @CISA Email Reflector
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Cybersecurity and Infrastructure Security Agency CISA
Update to How CISA Shares Cyber-Related Alerts and Notifications | CISA
CISA is changing how we announce cybersecurity updates and the release of new guidance.