essage with two parts. The first part is 
-- plain text, the second part is a PNG image, encoded as base64.
source = smtp.message{
  headers = {
     -- Remember that headers are *ignored* by smtp.send. 
     from = "Sicrano de Oliveira &lt;sicrano@example.com&gt;",
     to = "Fulano da Silva &lt;fulano@example.com&gt;",
     subject = "Here is a message with attachments"
  },
  body = {
    preamble = "If your client doesn't understand attachments, \r\n" ..
               "it will still display the preambl