如何在Rails上发送电子邮件

# config/environments/development.rb
config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = {
  address: "smtp.example.com",
  port: 587,
  domain: "example.com",
  user_name: "your_username",
  password: "your_password",
  authentication: "plain",
  enable_starttls_auto: true
}

<!-- app/views/user_mailer/welcome_email.html.erb -->
<h1>Welcome to My Website</h1>
<p>Dear <%= @user.name %>,</p>
<p>Thank you for signing up!</p>

# app/mailers/user_mailer.rb
class UserMailer < ActionMailer::Base
  default from: "noreply@example.com"

  def welcome_email(user)
    @user = user
    mail(to: @user.email, subject: "Welcome to My Website")
  end
end

# app/controllers/users_controller.rb
class UsersController < ApplicationController
  def create
    @user = User.new(user_params)
    if @user.save
      UserMailer.welcome_email(@user).deliver_now
      redirect_to root_path, notice: "User created successfully."
    else
      render :new
    end
  end
end