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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.

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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

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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.