title: Sending xlsx file using SMTP & Python 3
body: <p>I'm having trouble getting the SMTP server to keep my filenames as I attach them to emails and send them.  I ran this twice, and it worked perfectly.  The name and excel sheet showed as they were supposed to.  Now, no matter what I do, the attachment is always something like ATT00001.xlsx  when it used to work just fine.  (literally left for lunch break and re-ran it when I got back with no changes)  I'm wondering if it's how i'm attaching the excel sheet to my email.  Would anyone happen to know what's going on with this?  Thanks!</p>
  
  <pre><code>msg = MIMEMultipart()
  sender='email@email.org'
  recipients='email@recipient.org'
  server=smtplib.SMTP('mail.server.lan')
  
  msg['Subject']='Quarterly Summary'
  msg['From']=sender
  msg['To']=recipients
  
  
  
  filename = r'C:\Users\user.chad\Quarterly\project\output\MyData.xlsx'
  attachment = open(r'C:\Users\user.chad\Quarterly\project\output\MyData.xlsx', 'rb')
  xlsx = MIMEBase('application','vnd.openxmlformats-officedocument.spreadsheetml.sheet')
  xlsx.set_payload(attachment.read())
  
  encoders.encode_base64(xlsx)
  xlsx.add_header('Content-Dispolsition', 'attachment', filename=filename)
  msg.attach(xlsx)
  
  server.sendmail(sender, recipients, msg.as_string())
  server.quit()
  attachment.close()
  </code></pre>