Reach & Engage OneMail API

Bulk email that lands in the inbox

OneMail API is OneMarketer’s bulk email service: design, personalize and measure every campaign, and protect your domain’s reputation with unsubscribes and bounces handled automatically.

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We have advised major brands in 16 countries

  • Abbott
  • AFP Capital
  • AFP Habitat
  • Avon
  • Banco General
  • Banco Promerica
  • Caja Los Andes
  • Cargo Expreso
  • Castaño
  • Cencosud
  • Chilexpress
  • Claro
  • Coca-Cola Andina
  • D&C
  • Econorent
  • Entel
  • Froneri
  • Global Bank
  • Izipay
  • LATAM Airlines
  • L'Oréal
  • Mallplaza
  • Manpower
  • Niu
  • Posadas
  • RAC Asistencia
  • Ripley
  • Simmons
  • SMU
  • SURA
  • Telefónica
  • Transbank
  • Tur-Bus
  • Universidad de Las Américas
  • Universidad Tecnológica del Perú
  • Vivo
  • WOM

Why your email campaigns need OneMail API

  • Better deliverability

    Visible unsubscribes, plus bounces and complaints excluded automatically, keep your list clean.

  • No-code design

    Build emails with text, image, button and divider blocks that render well in any email client.

  • End-to-end measurement

    Sent, delivered, opened and clicked per campaign, per hour and per link.

  • Replies that get handled

    If a customer replies to the email, it can start a bot flow or reach an agent.

How it works

  1. 1

    Prepare the audience

    Import your list as CSV; every column becomes an email variable.

  2. 2

    Design the template

    Use the block editor or your own HTML, with conditional content per segment.

  3. 3

    Test and schedule

    Send yourself a test copy and set the send time or an A/B test.

  4. 4

    Measure and optimize

    Review the funnel, the open heatmap and the most-clicked links.

Features

  • Block editor

    Drag in text, headings, images, buttons and spacers; the HTML is generated for you.

  • Personalization and conditions

    Per-recipient variables and blocks shown only to a segment, such as VIP customers.

  • A/B tests

    Split the audience across template variants and compare their performance.

  • Scheduled sends

    Set the send time and let the campaign progress at the configured pace.

  • Opens and clicks

    Per-recipient tracking, hourly series, weekly heatmap and link ranking.

  • Unsubscribes and bounces

    One-click unsubscribe, hard and soft bounces and complaints go to a suppression list.

  • Test send

    Get a copy flagged as a test before launch, without touching the send queue.

  • CSV export

    Download each send’s results and the suppression list for your BI.

Use cases

  • Retail and e-commerce

    Launches, segment-based offers and newsletters with per-link measurement.

  • Banking and insurance

    Customer communications and renewal campaigns with per-recipient traceability.

  • Education

    Admission calls and applicant notices with replies that reach an advisor.

  • B2B services

    Lead nurturing with conditional content based on each contact’s profile.

Frequently asked questions

How does it protect my domain’s reputation?

It adds an unsubscribe link to every email and automatically excludes bounces, complaints and unsubscribes from future sends.

Do I need to know HTML?

No. The block editor builds the email for you; if you prefer, you can also paste your own HTML.

What can I measure?

Deliveries, opens, clicks, bounces and unsubscribes per campaign, per hour and per link, with per-recipient detail.

What happens if a customer replies?

The reply is linked to the campaign and can start a bot flow or be routed to an agent.

Related products

Take your email campaigns to the next level

We’ll show you a campaign with your template, your list and its metrics.

Request your demo