Hyvor Relay

6.9easy start · #10 of 41
in Transactional Email Software

Free to practise onyes
Free trialnot on record
Well documentedyes
Runs where you worknot on record

Runs on api, self-hosted, Web.

Hyvor Relay is ranked #10 of 41 in transactional email software on The Geeks Club, made by Hyvor Relay (Paris, France). It runs on API, Self-hosted, Web. There is a free plan.

Hyvor Relay plans and pricing

All plans

Self-Hosted Open-Source Not published Unlimited usage · All features included · AGPL-3.0 license · Community support relay.hyvor.com · 23 Sept 2026

Enterprise License €10,000/yr Starting at €10,000/year; tailored pricing No AGPL-3.0 obligations · volume-based pricing · enterprise support · SLA options relay.hyvor.com · 3 Oct 2026

Cloud Standard €30/mo €30/month*; pricing estimated and will be finalized at launch 300,000 emails/month included · €1 per additional 10,000 emails · priority support · managed deliverability · SLA and uptime guarantee relay.hyvor.com · 3 Oct 2026

Self-Hosted Open-Source Free Free forever Unlimited usage · all features included · AGPL-3.0 obligations · community support relay.hyvor.com · 3 Oct 2026

Compared on transactional email software

Free plan: Yes
Monthly send limit: $300,000/mo
Inbound email: Yes
Delivery event webhooks: Yes
SMTP relay: Yes
Dedicated IP option: Yes

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The record

Product: Hyvor Relay is an open-source, self-hostable email API designed for developers.
Email sending: Its idempotent REST API supports HTML and plain text, attachments, custom headers, and multiple recipients.
Automation: The scope-based REST API can automate domain setup, suppressions, API keys, and webhooks.
Webhooks: Real-time event webhooks report deliveries, bounces, domain verifications, and other events.
Projects: Projects organize domains, API keys, and webhooks, and a project can send either transactional or distributional email, not both.
Delivery handling: Relay manages bounces, complaints, and suppressions, and provides searchable delivery logs with 30 days of retention.
Integrations: The self-hosting guide lists built-in Prometheus, Grafana, and Alertmanager integrations for monitoring and observability.
Deployment: Self-hosting requires PostgreSQL and uses Docker Compose or Docker Swarm; the guide describes single-server and multi-server deployments.
License: The self-hosted product is licensed under AGPL-3.0, and enterprise licensing changes the terms and support options while retaining the same features.
Authentication: Relay requires OpenID Connect (OIDC) for authentication and does not include its own login or signup system.
Security: The hosting documentation says its HTTP server has built-in application-layer rate limiting and recommends cloud-provider DDoS protection for network-layer attacks.
Email types: The getting-started guide says each project sends either transactional or distributional email, using separate IP pools to maintain reputation separately.
Newsletter limitation: Relay does not include built-in newsletter management features.
Maker and location: HYVOR says it was founded in 2020 and lists its address as Paris, France.

Where it ranks on The Geeks Club

Best Transactional Email Software in 2026#10 of 41

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Sources

relay.hyvor.com/docs· checked 3 Oct 2026
relay.hyvor.com· checked 3 Oct 2026
relay.hyvor.com/hosting· checked 3 Oct 2026
hyvor.com· checked 3 Oct 2026