Envello
Email API for billing and invoice emails

Invoices, receipts and dunning emails with an audit trail

Billing email carries personal and financial data, and customers dispute it months later. Envello keeps that data in the EU and keeps the delivery record long enough to prove what was sent.

Proof of delivery when it's disputed

Delivery logs are kept 90 days on Pro and are configurable up to 365 days on Scale, so a disputed invoice from last quarter is still traceable.

A DPA without a sales call

A signed data processing agreement is included on every plan, including Free. Your finance and legal teams get it from the dashboard.

Webhooks for payment flows

HMAC-signed delivered, bounced and complained events let your billing system react when a dunning email bounces.