HYVOR Relay
Paris open-source email API with webhooks, delivery logs and DKIM, free to self-host
Quick Overview
| Company | HYVOR, SIREN 914168042 |
|---|---|
| Category | Email Deliverability Alternatives |
| Headquarters | Paris, France |
| EU Presence | EU (France) |
| Open Source | Yes |
| Compliance | Open source (AGPL-3.0) |
| Pricing | Self-hosted free under AGPL-3.0 / Enterprise licence from €10,000 a year / Cloud Standard estimated at €30 a month with 300,000 emails included and €1 per extra 10,000, on a waitlist |
| Replaces | Amazon SES, Mailgun, SendGrid |
Detailed Review
HYVOR Relay is an email API from HYVOR in Paris, the same company that makes Talk, Blogs and Post, and it is the engine HYVOR Post sends through.
It exposes a REST API with idempotent requests, webhooks for deliveries and bounces, enforced DKIM signing per domain, automatic bounce, complaint and suppression handling, and searchable delivery logs kept for 30 days. The source is on GitHub under AGPL-3.0, and the self-hosted build includes an integrated DNS server, health checks and Prometheus and Grafana monitoring.
The pricing is unusual for this category because the free option is the software itself: self-hosting costs nothing under AGPL-3.0, an Enterprise licence that removes the AGPL obligations starts at €10,000 a year, and a managed Cloud Standard plan is shown at an estimated €30 a month with 300,000 emails included and €1 per extra 10,000.
The page marks that cloud price as estimated and offers a waitlist, so the managed service is not yet generally available as a buy-now product.
The honest gap is the same one as turboSMTP's, for a different reason. The Relay pages name no hosting location for the cloud service and no security certification, and self-hosting means deliverability, IP reputation and DMARC are yours to run. Single sign-on through OpenID Connect is required, since Relay has no built-in login.
What HYVOR Relay does well
- Open source under AGPL-3.0, free to self-host with all features
- Registered Paris company with SIREN and VAT number on its own site
- Delivery logs, webhooks and suppression handling included
- Prices in euros are published, including an Enterprise licence
- Used by HYVOR's own newsletter product
Where HYVOR Relay falls short
- Managed cloud is on a waitlist with an estimated price
- No published cloud hosting location or security certification
- Self-hosting requires an OpenID Connect provider and your own deliverability work
- Enterprise licence starts at €10,000 a year
Standout feature. The only entry here that is open source under AGPL-3.0 and free to run yourself, with a managed cloud plan still on a waitlist.
Pros and Cons
Pros
- Open source under AGPL-3.0, free to self-host with all features
- Registered Paris company with SIREN and VAT number on its own site
- Delivery logs, webhooks and suppression handling included
- Prices in euros are published, including an Enterprise licence
- Used by HYVOR's own newsletter product
Cons
- Managed cloud is on a waitlist with an estimated price
- No published cloud hosting location or security certification
- Self-hosting requires an OpenID Connect provider and your own deliverability work
- Enterprise licence starts at €10,000 a year
Alternatives to HYVOR Relay
Frequently Asked Questions
What is HYVOR Relay?
HYVOR Relay is an email API from HYVOR in Paris, the same company that makes Talk, Blogs and Post, and it is the engine HYVOR Post sends through.
It exposes a REST API with idempotent requests, webhooks for deliveries and bounces, enforced DKIM signing per domain, automatic bounce, complaint and suppression handling, and searchable delivery logs kept for 30 days. The source is on GitHub under AGPL-3.0, and the self-hosted build includes an integrated DNS server, health checks and Prometheus and Grafana monitoring.
Where is HYVOR Relay based?
HYVOR Relay operates from Paris, France, which places it under EU (France). Compliance: Open source (AGPL-3.0).
What does HYVOR Relay cost?
Self-hosted free under AGPL-3.0 / Enterprise licence from €10,000 a year / Cloud Standard estimated at €30 a month with 300,000 emails included and €1 per extra 10,000, on a waitlist.
Who is HYVOR Relay best for?
Developers who want an open-source email API they can run themselves. The only entry here that is open source under AGPL-3.0 and free to run yourself, with a managed cloud plan still on a waitlist.
What are the drawbacks of HYVOR Relay?
Managed cloud is on a waitlist with an estimated price. No published cloud hosting location or security certification. Self-hosting requires an OpenID Connect provider and your own deliverability work. Enterprise licence starts at €10,000 a year.
Is HYVOR Relay a good alternative to Amazon SES?
HYVOR Relay is built as a European alternative to Amazon SES: Paris open-source email API with webhooks, delivery logs and DKIM, free to self-host. It will not be a like-for-like feature match in every respect, so check the review above for where the two genuinely differ before switching.
How does HYVOR Relay compare to other Email Deliverability Alternatives tools?
HYVOR Relay is one of several European Email Deliverability Alternatives tools we cover. It is most often compared with Amazon SES, Mailgun, SendGrid.