Is there is any way to send messages to chunk of emails ID's concurrently using smptlib

Minesh Patel minesh at
Tue May 5 13:39:59 EDT 2009

On Mon, May 4, 2009 at 2:01 PM, Piet van Oostrum <piet at> wrote:
>>>>>> gganesh <ganesh.gbg at> (g) wrote:
>>g> Hi friends,
>>g> I suppose sendmail() can send mails one by one ,how to send mails
>>g> concurrently ,
>>g> It would be very grateful,if someone could point out a solution.

You can always use twisted which has an smtp library which is used for
concurrency. Not a complete working example but an understanding of
deferreds is required.


from twisted.mail import smtp
from twisted.internet import reactor, defer

  def sendEmail(to, message, subject="Testing",
                 _from='foo at'):
      """Used to send emails asyncronously to multiple recipients"""
      msg = MIMEText(message)
      msg['Subject'] = subject
      msg['From'] = _from
      msg['To'] = ", ".join(to)

      sending = smtp.sendmail('localhost', _from, to, msg)
      sending.addCallback(sendComplete, to).addErrback(sendFailed)

   def sendFailed(error):
      print "Email failed: %r" % (error.getTraceback(),)

   def sendComplete(result, recipients):
      numDelivered, addrInfo = result
      print addrInfo
      if (numDelivered != len(recipients)):
         log.msg(SmtpError, "Not all recipients received email %r" % addrInfo)

buf = 'TESTING'
sendEmail(to=['to at'], message=buf)


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