Sending an email through Amazon SES using pure HTTP POST requests. You could potentially replicate this on curl.

ses_pure_http_post.rb

require 'net/http'
require 'uri'
require 'cgi'
require 'time'
require 'base64'

@accesskey = "adfdlkf"
@secretaccesskey = "dfkjldf"

opts = {"Action" => "SendEmail",
        "Source" => "[email protected]",
        "Destination.ToAddresses.member.1" => "[email protected]",
        "Message.Subject.Data" => "hi",
        "Message.Body.Html.Data" => "hi2",
        "AWSAccessKeyId" => @accesskey,
        "Timestamp" => Time.now.getutc.iso8601 
        }


def amzn_auth_header(req_date)
  digest = OpenSSL::HMAC.digest(OpenSSL::Digest::SHA1.new, @secretaccesskey, req_date)
  sign = Base64.encode64(digest).gsub("\n", '')
  "AWS3-HTTPS AWSAccessKeyId=#{@accessKeyId},Algorithm=HmacSHA1,Signature=#{sign}"
end

req_date = Time.now.getutc.rfc2822

headers = { 
          "X-Amzn-Authorization" => amzn_auth_header(req_date),
          #"Date" => Time.now.getutc.httpdate
          "x-amz-date" => req_date 
          }


puts opts.collect {|k,v| "#{k}=#{CGI::escape(v.to_s)}"}.join('&')

uri = URI.parse("https://email.us-east-1.amazonaws.com")

http = Net::HTTP.new(uri.host, uri.port)
http.verify_mode = OpenSSL::SSL::VERIFY_NONE
http.use_ssl = true


request = Net::HTTP::Post.new("/") 
headers.collect {|k,v| request.add_field(k,v) }
puts request.to_hash
request.set_form_data(opts)
response = http.request(request)

print response.body