Buttondown makes it easy to start collecting subscriptions without having to muck around and changing your CMS.
Note
This blog post is from 2019. Contents (and screenshots) may be a bit of out date, but we've kept it up out of posterity.
You can create a subscription form in Webflow and connect it to your Buttondown newsletter to gather email addresses and segment them in two easy steps:
Grabbing your subscription URL from Buttondown
Configuring your Webflow form to forward emails to Buttondown