Hack for sending Emails using Amazon SES without having to depend on Mail.

ses.rb

require 'httparty'
require 'hmac-sha2'
require 'base64'
require 'cgi'

module Amazon
  module SES
    OPTIONS = {
      :access_key => '...',
      :secret_key => '...'
    }

    class Email
      include HTTParty

      format   :xml
      base_uri 'https://email.us-east-1.amazonaws.com'

      attr_accessor :from
      attr_accessor :to
      attr_accessor :subject
      attr_accessor :body

      def initialize(opts = {})
        opts.each { |k, v| send("#{k}=", v) if respond_to?("#{k}=") }
      end

      def deliver
        time     = Time.now
        url_time = time.strftime('%Y-%m-%dT%H:%M:%S.000Z')
        sig_time = time.gmtime.strftime('%a, %d %b %Y %H:%M:%S GMT')
        options  = {
          :headers => {
            'X-Amzn-Authorization' => signature(sig_time),
            'Date'                 => sig_time
          },
          :query => {
            :Action => 'SendEmail',
            :Source => from,
            :'Destination.ToAddresses.member.1' => to,
            :'Message.Subject.Data'   => subject,
            :'Message.Body.Text.Data' => body,
            :AWSAccessKeyId => OPTIONS[:access_key],
            :Timestamp      => url_time,
            :Version        => '2010-12-01'
          }
        }

        response = self.class.post('/', options)

        if response.key?('ErrorResponse')
          msg = response.parsed_response['ErrorResponse']['Error']['Message']

          raise "Failed to send the Email: #{msg}"
        else
          return response.parsed_response['SendEmailResponse'] \
            ['SendEmailResult']['MessageId']
        end
      end

      def signature(time)
        hash = HMAC::SHA256.new(OPTIONS[:secret_key])
        hash.update(time)
        hash = Base64.encode64(hash.digest).chomp

        return "AWS3-HTTPS AWSAccessKey=#{OPTIONS[:access_key]}, " \
          "Signature=#{hash}, Algorithm=HmacSHA256"
      end
    end # Email
  end # SES
end # Amazon

email = Amazon::SES::Email.new(
  :from    => '...',
  :to      => '...',
  :subject => 'Testing Ruby Hacks',
  :body    => 'Lorem ipsum dolor sit amet'
)

p email.deliver