Zapier is a best-in-class automation tool that lets you link together web apps and data feeds to automate workflows and build out processes quickly. (Personally speaking, I love Zapier.) Buttondown's Zapier integration lets you create workflows that both feed into and stem out from your newsletter, letting you do things like automatically create new subscribers and emails or initiate actions whenever you get a new subscriber or unsubscriber.
Get notified in a custom channel when a new address subscribers or churns.
Automatically create new subscribers based on Google Forms or Google Sheets data.
Automatically add new Gumroad customers as subscribers with tags and metadata.
Create new drafts or publish new emails in responses to new RSS items.