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Prerequisites

Before you start, you’ll need:

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Guide

1

Setup your environment

Add these lines of code into your environment config file.
config/environments/environment.rb
config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = {
  :address   => 'smtp.resend.com',
  :port      => 465,
  :user_name => 'resend',
  :password  => ENV['RESEND_API_KEY'],
  :tls => true
}
2

Send email using Rails Action Mailer

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=>....}

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Examples

Rails SMTP Example

See the full source code.