Hey Rob, we (www.courier.com) sit on top of your existing email provider(s) – Mailgun in your case – and help make common email and notification tasks easy: -

Hey Rob, we (www.courier.com) sit on top of your existing email provider(s) – Mailgun in your case – and help make common email and notification tasks easy: - visual template builder - automatic retries - switching between service providers (permanently or for failover) If you implemented Mixpanel via Segment, we can also ingest those events directly from Segment into Courier (or you can call our API directly). We'll be releasing automations early next year to help make the advanced drip stuff easy – but we aren't there quite yet.