Integrate Lettr into third-party platforms and services. Each guide walks you through connecting Lettr for email delivery — whether through SMTP configuration, the HTTP API, or Edge Functions.Documentation Index
Fetch the complete documentation index at: https://docs.lettr.com/llms.txt
Use this file to discover all available pages before exploring further.
Available Integrations
Stripe
Send payment receipts, invoice emails, and subscription notifications
Supabase
Send auth emails and transactional messages from Supabase using Lettr
WordPress
Replace wp_mail with Lettr for reliable email delivery from WordPress
Zapier
Automate email sending with 8,000+ apps — no code required
Don’t See Your Platform?
You can integrate Lettr with any platform that supports SMTP or HTTP APIs.SMTP Relay
Connect any platform that supports SMTP credentials
HTTP API
Send emails from any language or platform via REST API
Need help integrating with a specific platform? Contact support and we’ll help you get set up.