# Hyvor Relay review (2026): is the free plan enough? > Open-source email API you can self-host Checked Nov 13, 2026 · graded Nov 13, 2026 by ToolGPA. Hyvor Relay is an open-source email API under the AGPL-3.0 license. It offers a REST API with idempotent sends, domain and DKIM management, webhooks, suppression handling and 30 days of delivery logs. It is self-hosted today, with a managed cloud version listed as a waitlist. - **Category:** Email Sending Services - **Made by:** Hyvor - **Website:** https://relay.hyvor.com - **Runs on:** Web - **Who should skip it:** Skip it if you do not run servers, as self-hosting leaves deliverability to you. - **Facts last checked:** Nov 13, 2026 ## Pricing As of Nov 13, 2026, Hyvor Relay has a free plan, and paid plans start at €10,000 per year and up (Enterprise License). - **Pricing model:** Free plan - **Free plan:** Self-hosted open-source edition: free with unlimited usage under AGPL-3.0 and community support. - **Free trial:** None listed. | Plan | Price | What you get | | --- | --- | --- | | Self-Hosted Open-Source | $0 | You host it yourself under AGPL-3.0, with all features and community support. | | Enterprise License | €10,000 per year and up | The same features without AGPL-3.0 obligations, with volume-based pricing, enterprise support and SLA options. | Read from https://relay.hyvor.com on Nov 13, 2026. Prices change, so confirm with Hyvor Relay before buying. ## Key features - **Email API:** A REST API with idempotent sends, HTML and plain text, attachments, custom headers and multiple recipients. - **Domains and DKIM:** Multiple sending domains with enforced DKIM signing and an in-built DNS server. - **Webhooks:** Event webhooks for deliveries, bounces and domain verification. - **Bounce and complaint handling:** Bounces, complaints and suppressions are managed automatically. - **Projects:** Isolated projects each with their own domains, keys and webhooks. - **Observability:** Prometheus and Grafana integrations and health checks for servers, DNS and IP reputation. ## Good for - Teams that want to run their own sending infrastructure - Organizations that need a commercial license instead of AGPL-3.0 ## Worth knowing - The cloud plan is on a waitlist, listed at an estimated €30 per month for 300,000 emails and not yet final. - Self-hosting means running servers, IPs and deliverability yourself. - Delivery logs are kept for 30 days. - The page states the Enterprise License starts at €10,000 a year and is priced by volume. ## ToolGPA grades **GPA: 1.8 out of 4**, graded Nov 13, 2026. Hyvor Relay is an open-source email API you run on your own servers, free under AGPL-3.0. A hosted cloud plan is only a waitlist with an estimate of €30 a month, so for now you either run servers and deal with delivery yourself or pay from €10,000 a year. - **Value for money: C.** Free only if you host it yourself, which needs servers and IPs, so it sits in the middle. The Enterprise License starts at €10,000 a year, and the cloud plan is an unconfirmed estimate. - **Free plan and trial: C.** The open-source edition is free with unlimited usage, but you must run it yourself, and there is no hosted free tier. - **Features: C.** Email API, DKIM domains, webhooks, bounce and complaint handling, projects and observability. Delivery logs last 30 days. - **Ease of use: D.** No rating on record. Self-hosting means servers, DNS, IP reputation and deliverability are yours to run. - **Platforms and integrations: C.** Web interface and API, with Prometheus, Grafana and Docker Swarm hooks. No apps. These are ToolGPA's own grades. Graded from this listing, whose facts were read from Hyvor's own pages on 13 November 2026. Not based on using the product, and shorter than our full reviews. ## Where it stands among email sending services - Hyvor Relay's GPA of 1.8 is higher than 4 of the 50 other email sending services we grade, and level with 4. - It stands best on free plan and trial (C, above 11 of 50) and worst on ease of use (D, above 0). - Its paid plans start at about $931 a month, against a middle price of $15 for the category: 41 of the 41 others that charge start lower. - On features, ease of use and platforms it scores 1.7 out of 4. 41 tools score higher and cost less. The category's chart of price against score: https://toolgpa.com/charts/email-sending ## Keep it, or make your own? **Keep it.** To replace Hyvor Relay you would be making mail servers with a good name among inbox providers. That is not a weekend's work, with an AI app builder or without one. That makes this kind of software worth paying for, not this one in particular: 42 of the 50 other email sending services grade higher. It costs $11,172 a year. Hyvor Relay is open source, so there is a third way: take its code and run it yourself. - You could not: Mail servers with a good name among inbox providers. - You could not: It plugs into other products, Prometheus, Grafana and Docker Swarm among them, and has an API. A judgement by ToolGPA from this listing, by rules that are the same for every tool. Nothing was built to test it. ## Works with Prometheus, Grafana, Docker Swarm **Tags:** Transactional email, Open source, Self-hostable, Public API ## Alternatives - [Plunk](https://toolgpa.com/tools/plunk): Open-source email platform for transactional and marketing mail. [Compare](https://toolgpa.com/compare/hyvor-relay-vs-plunk) - [Postmark](https://toolgpa.com/tools/postmark): Transactional email API and SMTP, with broadcasts on a separate stream. [Compare](https://toolgpa.com/compare/hyvor-relay-vs-postmark) - [Mailgun](https://toolgpa.com/tools/mailgun): Email API and SMTP relay for developers, with list validation. [Compare](https://toolgpa.com/compare/hyvor-relay-vs-mailgun) - [Amazon SES](https://toolgpa.com/tools/amazon-ses): AWS email sending and receiving, paid per 1,000 emails. [Compare](https://toolgpa.com/compare/amazon-ses-vs-hyvor-relay) - [KumoMTA](https://toolgpa.com/tools/kumomta): Open-source mail server for high-volume, self-run email sending. [Compare](https://toolgpa.com/compare/hyvor-relay-vs-kumomta) ## Sources The prices, plans, platforms and features above were read from these pages on Nov 13, 2026: - https://relay.hyvor.com Page: https://toolgpa.com/tools/hyvor-relay Listed by ToolGPA (toolgpa.com).