Hyvor Relay
by Hyvor Relay · Open-source, self-hosted email API for developers
BenchRank score
Screenshots of Hyvor Relay
Homepage
Overview
Hyvor Relay is an email sending service you run on your own infrastructure, offering a REST API for sending mail plus scope-based APIs for domains, suppressions, API keys and webhooks. It signs mail with DKIM, runs an integrated DNS server for MX, SPF and DKIM records, handles bounces and complaints, and scales horizontally with Docker Swarm.
- Best for
- Developers who want to self-host a transactional email API instead of using SES, Mailgun or SendGrid.
- Pricing
- Self-hosting is free under AGPL-3.0; an enterprise licence starts at €10,000/year, and the not-yet-launched Cloud plan is estimated at €30/month for 300,000 emails plus €1 per extra 10,000.
- Runs on
- Self-hosted
Strengths and trade-offs
Strengths
- Open-source under AGPL-3.0, with all features in the free build
- Built-in DNS server handles MX, SPF and DKIM records
- Delivery logs with headers, status and SMTP traces for 30 days
- Prometheus and Grafana integrations for monitoring
Trade-offs
- AGPL-3.0 obligations unless you buy a licence from €10,000/year
- Hosted Cloud is waitlist-only, planned for Q1 2026 at estimated prices
- No built-in login or signup: an OIDC provider is required
- No newsletter or marketing email features; Hyvor Post is a separate product
How Hyvor Relay markets itself
A structured read of the promise, proof and page design on Hyvor Relay’s captured homepage.
Homepage capture
“Hyvor Relay”
- Angle: Developer-first
- Hero: Form in hero
Pricing
Published plans and prices from Hyvor Relay’s own pricing page.
How this score is made up
Each dimension is scored out of 100 and combined into the headline score using fixed weights.
MCP support
Whether an agent can drive the product through the Model Context Protocol, and how much setup that takes.
API quality
Public API surface: machine-readable spec, official SDKs, documented auth, errors, rate limits and versioning.
Documentation
Publicly reachable docs — coverage, freshness, code samples and machine readability.
Agent friendliness
How readable the site is to an automated client: llms.txt, structured data, server-rendered content, crawler access.
Changelog
A public, dated record of what shipped and when — the clearest signal that a product is still alive.
Marketing site structure
Whether the site answers a buyer's questions: clear positioning, the pages that matter, and accessibility.
Page speed
How fast the site loads for real visitors: Chrome UX Report 75th-percentile LCP, INP and CLS, with a Lighthouse mobile run standing in where a site has too little traffic for field data.
Operational trust
Status page and incident history, security disclosure, compliance and data-processing documentation.
Measured, but not part of the score
Useful to know, but not a mark for or against the product — so these do not affect the ranking.
Openness
Source availability, self-hosting, data export and open standards. Scored and shown, but not part of the composite — paid SaaS is not worse for being paid SaaS.
Maintenance
Release cadence and repository activity. Scored and shown, but not part of the composite — it is only measurable for open repositories.
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Where this comes from
The Hyvor Relay pages BenchRank reads when it scores the product — its documentation, release notes, status and security pages, and its repository where there is one.
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