python - smtplib.SMTPRecipientRefused error while sending email -

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i have basic email code looks this: 

#sendmail function send multiple attachments multiple users @   same time  def sendmail(to, fro, subject, text, files=[], server="localhost"):     assert type(to) == list     assert type(files) == list     msg = mimemultipart()     msg['from'] = fro     msg['to'] = commaspace.join(to)     msg['date'] = formatdate(localtime=true)     msg['subject'] = subject     msg.attach(mimetext(text, 'html')) #    print "obtained files:",files      file in files:         part = mimebase('application', "octet-stream")         part.set_payload(open(file.strip(' '), "rb").read())         encoders.encode_base64(part)         part.add_header('content-disposition', 'attachment; filename="%s"'                        % os.path.basename(file))         msg.attach(part)     smtp = smtplib.smtp(server)     smtp.sendmail(fro, to, msg.as_string())     smtp.close()

error receiving:

smtplib.smtprecipientsrefused: {'firstname.lastname@work.com': (553, '5.5.4 <firstname.lastname@work.com>... domain name required sender address a.b@work.com')}

what reason of following error , how can resolve same? have been stuck on since many hours !!! ps: my port 25 working , using python 2.7.9 , ubuntu 15.04


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