-- load the smtp support and its friends
local smtp = require("socket.smtp")
local mime = require("mime")
local ltn12 = require("ltn12")

-- creates a source to send a message with two parts. The first part is
-- plain text, the second part is a PNG image, encoded as base64.
source = smtp.message{
  headers = {
     ["content-type"] = 'multipart/mixed; charset=utf-8',
     -- Remember that headers are *ignored* by smtp.send.
     from = "章文 <zwgb2002@163.com>",
     to = "zhangwen <zhangwen@ct108.com>",
     subject = "自动发送 Here is a message with attachments"
  },
  body = {
    preamble = "If your client doesn't understand attachments, \r\n" ..
               "it will still display the preamble and the epilogue.\r\n" ..
               "Preamble will probably appear even in a MIME enabled client.",
    -- first part: no headers means plain text, us-ascii.
    -- The mime.eol low-level filter normalizes end-of-line markers.
    [1] = {
      headers = {
          ["content-type"] = 'text/plain; charset=utf-8'
      },
      body = mime.eol(0, [[
        Lines in a message body should always end with CRLF.
        The smtp module will *NOT* perform translation. However, the
        send function *DOES* perform SMTP stuffing, whereas the message
        function does *NOT*. 测试
      ]])
    },
    -- second part: headers describe content to be a png image,
    -- sent under the base64 transfer content encoding.
    -- notice that nothing happens until the message is actually sent.
    -- small chunks are loaded into memory right before transmission and
    -- translation happens on the fly.
    [2] = {
      headers = {
        ["content-type"] = 'image/png; name="image.png"',
        ["content-disposition"] = 'attachment; filename="image.png"',
        ["content-description"] = 'a beautiful image',
        ["content-transfer-encoding"] = "BASE64"
      },
      body = ltn12.source.chain(
        ltn12.source.file(io.open("image.png", "rb")),
        ltn12.filter.chain(
          mime.encode("base64"),
          mime.wrap()
        )
      )
    },
    epilogue = "This might also show up, but after the attachments"
  }
}

io.write("Enter password: ")
local pass = io.read()

-- finally send it
r, e = smtp.send{
    from = "<zwgb2002@163.com>",
    rcpt = "<zhangwen@ct108.com>",
    source = source,
    server = "smtp.163.com",
    user = "zwgb2002",
    password = pass
}

if not r then
    print(e)
else
    print("send ok!")
end