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Prerequisites

Before you start, you’ll need:

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Guide

1

Install

Get the Resend Ruby SDK.
gem install resend
2

Send email using HTML

The easiest way to send an email is by using the html parameter.
index.rb
require "resend"

Resend.api_key = "re_xxxxxxxxx"

params = {
  "from": "Acme <onboarding@resend.dev>",
  "to": ["delivered@resend.dev"],
  "subject": "hello world",
  "html": "<strong>it works!</strong>"
}

sent = Resend::Emails.send(params)
puts sent

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Examples

Basic Send

Basic email sending

Attachments

Send emails with file attachments

Templates

Send emails using Resend hosted templates

Scheduling

Schedule emails for future delivery

Audiences

Manage contacts and audiences

Domains

Create and manage sending domains

Inbound Webhooks

Receive and process inbound emails

Double Opt-in

Double opt-in subscription flow

Sinatra App

Full Sinatra web application

Rails App

Full Rails web application