# smtpdirectsend.py -- use pydns and smtplib to send email directly without queuing

# by Tony Nelson  06 Oct 2013
#                 10 Jul 2016

# Derived from 11.12.2 SMTP Example, Python Library Reference Release 2.4.3.
# Modified for Direct Send, without queuing via a local SMTP server.
# On a web site, useful to validate an email address, but AOL fails (again),
# so only warn the user.  For greylisting, on failures keep the exact same
# message (and message-id:) unless the user changes the email address.

import smtplib

def prompt(prompt):
    return raw_input(prompt).strip()

fromaddr = prompt("From: ")
to_addr = prompt("To: ").split()[0]         #DirectSend  only one To: addr
print "Enter message, end with ^D (Unix) or ^Z (Windows):"

# Add the From: and To: header fields at the start!
msg = ("From: %s\r\nTo: %s\r\n"
       % (fromaddr, to_addr))
#DirectSend  added:
from email.Utils import make_msgid
msg += ( "Message-ID: %s\r\nSubject: Direct Send Test\r\n\r\n"
       % make_msgid() )

while 1:
    try:
        line = raw_input()
    except EOFError:
        break
    if not line:
        break
    msg = msg + line

print "Message length is " + repr(len(msg))

#DirectSend  added:
import DNS                                  # http://pydns.sourceforge.net
DNS.DiscoverNameServers()
to_domain = (to_addr+'@').split('@')[1]
if not to_domain:
    raise ValueError, '''Invalid email address "%s"''' % to_addr
mx = ( DNS.mxlookup(to_domain)              # get sorted MX records, 
    or [(None,to_domain)]                   # fall back to A record,
     )[0][1]                                # choose first (best) mx
req = DNS.DnsRequest(mx, qtype='A')         # must exist ("helpful" sendmail)
resp = req.req()
if not len(resp.answers):
    raise ValueError, '''Domain "%s" not found''' % to_domain
print '''Sending to domain "%s"''' % mx

server = smtplib.SMTP(mx)                   #DirectSend  was 'localhost'
#server.set_debuglevel(1)
server.sendmail(fromaddr, [to_addr], msg)
server.quit()