If you have a blog, events feed, news page, or other CMS driven page on your site, you can broadcast it to your eager readers using an RSS-triggered email campaign.
Setup your website, CMS, and RSS
Setup your email newsletter campaign in the service of your choice, e.g. MailerLite
Styling wise, you're only restricted to what your email newsletter provider gives you in the designer. In newsletters, you won't get Webflow-level design capabilities in part because email readers are FAR more inconsistent and picky than browsers are.
Email HTML is a weird mongoloid cousin of normal HTML.
Personally Mailchimp has lost favor with me, because of their UI changes and pricing changes, and because I've had serious issues migrating customers there with existing customer lists.
Note that Webflow does not emit rich text content in the RSS feed, so you can't deliver the full article content anyway- you'd link back to your site from the email.