Delivery
KumoMTA outbound, transactional outbox, bounce and complaint handling with evidence-based suppressions.
Email infrastructure you operate.
Licensed platforms on your servers. Our own mail is permission-based, documented, and accountable.
Built as a product company
Letterry ships licensed email infrastructure: control plane, delivery stack, and operator tooling for teams that keep mail on hosts they control. We are not a rented blast list.
What we build
Control plane
Domains, DNS, IP pools, outbox, suppressions, and audit in a real operator console.
Inject API
HTTP and SMTP inject with idempotency, signed webhooks, and clear delivery semantics.
Our outbound
Opt-in marketing, working unsubscribe, and suppression on hard bounces and complaints.
What reviewers can verify
- 01Privacy and termsThe policy and the terms are published here, with a date.
- 02Abuse and complianceNamed mailboxes for abuse and compliance, not a form alone.
- 03Sending practicesWhat we send, who may receive it, and how to stop it.
- 04A named senderLetterry is the company. The mail is not from a nameless domain.