Helo is built by a lean, independent team of email-industry veterans. The company (Helo Ehlo LLC) is bootstrapped and self-funded — no VC money or outside investors — and states that profitability and long-term sustainability are priorities.

How do I integrate Helo?

You can integrate via Helo's API or send via SMTP; the site claims you can be up and running in minutes. Documentation is available in the product docs.

Helo — An email API that actually delivers

Helo is a modern email delivery service offering an API and SMTP for sending transactional and promotional email. Built by experienced email deliverability specialists, it helps developers reach the inbox reliably, with easy separation of email streams and support for multi-tenant platforms sending on behalf of their users. Pricing is pay-as-you-go, so customers only pay for what they use.

Key Features

Email API and SMTP sending

Send email via a powerful API or over SMTP, with integration described as taking minutes.

Deliverability focus

The team states deliverability is its number one priority, working to ensure emails reach inboxes fast and reliably.

Sending isolation for transactional vs. promotional email

Separate transactional and promotional sending so a newsletter can't hurt password-reset deliverability; multi-tenant environments are fully supported.

Sending on behalf of platforms

Fully isolated email sending for each of your customers, spammer detection to protect sender reputation, and easy sending from customers' own domains.

Analytics and webhooks

Detailed analytics and unlimited webhooks are included in the single plan.

Unlimited domains and users

The one plan includes unlimited sending domains and unlimited users, with multi-tenant sending built in.

How It Works

Sign up and verify your domain

Start with 1,000 free test emails by sending to recipients on a domain you've already verified in Helo.

Integrate via API or SMTP

Connect your application using Helo's API or SMTP integration to start sending in minutes.

Send and pay per email

Send transactional or promotional email (isolated per tenant if needed) and pay only for the emails you send plus a $5 monthly platform fee.

Pros & Cons

Pros

Simple, single-plan pricing: $5/month platform fee plus $0.00035 per email, with no tiers, volume commitments, or overage fees
Deliberately isolates transactional and promotional sending, and supports fully isolated sending per customer for multi-tenant platforms
Deliverability is stated as the company's top priority
1,000 free test emails for exploring the product before paying
Unlimited users, domains, and webhooks included in the single plan
Independent, bootstrapped company with human support included at no extra cost

Who It's For

Best for

Developers and small teams who want a simple, affordable email API or SMTP service with usage-based pricing
SaaS platforms that send email on behalf of their users and need per-tenant sending isolation and spam protection
Senders who dislike tiered bundles, volume commitments, and overage penalties
Products that need to keep transactional and promotional email streams separate

Not ideal for

Spammers or senders looking for free unlimited sending — Helo explicitly restricts free sending to 1,000 test messages on your own domain
Organizations that require an established vendor with investor backing or enterprise procurement credentials

Use Cases

Sending transactional emails such as password resets and notifications from applications

Sending newsletters and other promotional email from a separate, isolated stream

Platforms and SaaS products sending email on behalf of their own users or tenants

Multi-tenant environments that need per-customer sending isolation and custom domains

Teams that want usage-based email costs without plan tiers or overage penalties

Pricing

Usage-based pricing: a $5/month platform fee plus $0.00035 per email sent. There are no plan tiers, volume commitments, pre-paid allotments, or overage fees. New accounts get 1,000 free emails for testing (limited to recipients on your own verified domain). Everything — unlimited users, detailed analytics, unlimited domains, multi-tenant sending, unlimited webhooks, and support — is included in th

Single plan

$5/mo + $0.00035 per email

One plan with everything included: unlimited users, detailed analytics, unlimited domains, multi-tenant sending, unlimited webhooks, and outstanding support. 1,000 free emails available for testing.

FAQ

What is Helo?

Helo is an email delivery service offering an email API and SMTP sending, focused on deliverability so emails reach the inbox fast and reliably. It supports transactional and promotional sending, multi-tenant environments, and sending on behalf of other platforms.

How does Helo's pricing work?

Helo uses usage-based pricing: you pay for the emails you send ($0.00035 per email) plus a small $5/month platform fee for your account. There are no plan tiers, monthly or annual volume commitments, pre-paid allotments, or overage fees.

Does Helo offer a free plan?

There's no permanent free plan, but you get 1,000 free messages for testing, as long as you send them to recipients on your own verified domain. This limit exists because free sending is easily abused by spammers.

Can I send email on behalf of my own customers?

Helo