Sendy is a self-hosted email newsletter app that sends through Amazon SES. Connect your own installation with its API key, then add or remove subscribers from your lists as people register, buy, or change membership on your WordPress site.
Tap any recipe to install it as a starting point — all wires connected.
WooCommerce
Sendy 
ProfilePress
Sendy 
Gravity Forms
Sendy In your Sendy installation, open Settings and copy the API key. Note your installation URL and the Brand ID you want to sync into.
Go to FlowSync → Integrations → Sendy. Enter your installation URL, API key, and Brand ID, then save and test the connection. FlowSync pulls in your lists automatically.
In the workflow builder, click + Add step → Sendy, pick a list, and map fields from your trigger event with the inline payload picker.
Hit Run test to fire a sample payload. The run log shows the request sent to Sendy and the response, so you can confirm the subscriber landed on the right list.
Install FlowSync free, paste your API key, and pick a recipe to get started.