title: Installing a python package that is not available in anaconda (smtplib)
body: <p>I'm using anaconda on linux and I want to install <code>smtplib</code> to send mail.
  I have tried,</p>
  
  <p><code>conda install smtplib</code> which returned:</p>
  
  <p><code>PackageNotFoundError: Package missing in current linux-64 channels: 
    - smtplib</code> , 
  and,</p>
  
  <p><code>pip install smtplib</code> which returned:</p>
  
  <p><code>Could not find a version that satisfies the requirement smtplib (from versions: )
  No matching distribution found for smtplib</code></p>
  
  <p>I found that <code>smtplib</code> comes by default in the standard python distribution and I wonder why it is not available in anaconda. </p>
  
  <p><strong>Question:</strong> How to install smtplib? Or more generically, how to install a package that is not included in anaconda?</p>
  
  <p>There are similar questions <a href="https://stackoverflow.com/questions/34468952/sending-gmail-using-python-failing">here</a> and <a href="https://stackoverflow.com/questions/42495852/smptlib-not-available-for-anaconda-receiving-emails-using-python">here</a> but without any answers.</p>
  
  <hr>
  
  <p><strong>Spec</strong>: <code>Python 2.7.13 |Anaconda 4.3.1 (64-bit)| (default, Dec 20 2016, 23:09:15) 
  [GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux2</code></p>