Who is Helo built for?

Developers and platforms that send on behalf of their own customers, rather than a single company sending only its own mail.

How does multi-tenant sending work?

Customers send from their own domains, and stats, unsubscribes and credentials are kept separate per tenant, so one account's data never mixes with another's.

What stops a bad customer ruining delivery?

It is built to contain bad senders, which is the purpose of that per-tenant separation: one abusive tenant should not drag the rest down.

How do I integrate it?

REST and SMTP are both offered, plus SDKs, so you can move an existing SMTP integration across or build against the API.

Yes — Helo is listed as Agent Ready on Maarket.

Who is Helo best for?

Helo is listed as a fit for Startup teams.

What are the alternatives to Helo?

Other Developer Tools products on Maarket include 99tests, API Route, Autonomous Product Delivery (AutonomyAI), Bitrise Build Hub, Blume 2.0, Buddy Drop.

How is Helo ranked on Maarket?

Purely by Karma Points earned from community actions — reviews, recommends, use signals and clicks. There is no pay-to-rank; sponsor placements are always clearly labeled.

‹ Developer Tools

Helo — An independent email API from former Postmark folks

#18 in Developer Tools

⚡ 15 KP · ↗ 0 total clicks

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Helo at a glance

Category: Developer Tools
Best for: Startup
Agent compatibility: Agent Ready
Total clicks: 0
Pricing: View pricing ↗
Website: helohq.com ↗
X (Twitter): @Helo_Hq ↗
Recommends: 👍 0
I use this: ✋ 0
Reviews: ⭐ 0
Last updated: 5 Oct 2026

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About Helo

An email API from former Postmark people, built for developers and platforms that send on behalf of their customers. Contains bad senders, lets customers send from their own domains and keeps stats, unsubscribes and credentials separate per tenant, with REST, SMTP and SDKs.