Send emails with Rails

Send email using Rails Action Mailer

This gem can be used as an Action Mailer delivery method.First, let’s update or create your mailer initializer file with your Resend API Key.

config/initializers/mailer.rb

Resend.api_key = "re_xxxxxxxxx"

Add these lines of code into your environment config file.

config/environments/environment.rb

config.action_mailer.delivery_method = :resend

Then create a UserMailer class definition.

app/mailers/user_mailer.rb

class UserMailer < ApplicationMailer
  default from: 'Acme <onboarding@resend.dev>' # this domain must be verified with Resend
  def welcome_email
    @user = params[:user]
    @url = 'http://example.com/login'
    mail(to: ["delivered@resend.dev"], subject: 'hello world')
  end
end

And create your ERB email template.

app/views/user_mailer/welcome_email.html.erb

<!doctype html>
<html>
  <head>
    <meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
  </head>
  <body>
    <h1>Welcome to example.com, <%= @user.name %></h1>
    <p>You have successfully signed up to example.com,</p>
    <p>To log in to the site, just follow this link: <%= @url %>.</p>
    <p>Thanks for joining and have a great day!</p>
  </body>
</html>

Initialize your UserMailer class. This returns an ActionMailer::MessageDelivery instance.

u = User.new name: "derich"
mailer = UserMailer.with(user: u).welcome_email

# => #<ActionMailer::MessageDelivery:153700, @mail_message=#<Mail::Message...>, @processed_mailer=...>

Finally, you can now send emails using the deliver_now! method:

mailer.deliver_now!

# => {:id=>"a193c81e-9ac5-4708-a569-5caf14220539", :from=>....}

Send emails with Rails

Prerequisites

Guide

Examples

Rails App

Basic Send

Attachments

Templates

Scheduling

Audiences

Domains

Inbound Webhooks

Double Opt-in

​Prerequisites

​Guide

​Examples