title: Repl.it SMTPLIB OSError: [Errno 99] Cannot assign requested address
body: <p>I am trying to run simple emailsender.py script on repl.it to send an email.
  It works without any problem when I try to run it on desktop PC, but on repl.it I am having an error message <code>OSError: [Errno 99] Cannot assign requested address</code> as detailed below.
  The emailsender.py program looks like this:</p>
  <pre><code>import smtplib
  
  def send_email(username: str, key: str):
      reciever = username+&quot;@theirmail.cz&quot;
      sender = &quot;my_email@email.cz&quot;
      topic = &quot;Autothorization bot&quot;
      
      # header
      msg = &quot;From: %s\r\nSubject: %s\r\nTo: %s\r\n\r\n&quot; % (sender, topic, reciever)
  
      # add message content
      content = &quot;Your key is: &quot; + key
      msg += content
  
      server = smtplib.SMTP('smtp.seznam.cz')
      server.login('my_email@email.cz', &quot;my_email_password&quot;) 
      server.sendmail(sender, reciever, msg)
      server.quit()
  </code></pre>
  <p>When I try to run the script via python on repl.it, I get this error message after some time:</p>
  <pre><code>&gt;&gt;&gt; import emailsender
  &gt;&gt;&gt; emailsender.send_email(&quot;username&quot;, &quot;test_message&quot;)
  Traceback (most recent call last):
    File &quot;&lt;stdin&gt;&quot;, line 1, in &lt;module&gt;
    File &quot;/home/runner/botpy/emailsender.py&quot;, line 24, in send_email
      server = smtplib.SMTP('smtp.seznam.cz')
    File &quot;/usr/lib/python3.8/smtplib.py&quot;, line 253, in __init__
      (code, msg) = self.connect(host, port)
    File &quot;/usr/lib/python3.8/smtplib.py&quot;, line 337, in connect
      self.sock = self._get_socket(host, port, self.timeout)
    File &quot;/usr/lib/python3.8/smtplib.py&quot;, line 308, in _get_socket
      return socket.create_connection((host, port), timeout,
    File &quot;/usr/lib/python3.8/socket.py&quot;, line 808, in create_connection
      raise err
    File &quot;/usr/lib/python3.8/socket.py&quot;, line 796, in create_connection
      sock.connect(sa)
  OSError: [Errno 99] Cannot assign requested address
  </code></pre>
  <p>This .py script is a piece of larger discord.py bot that I am trying to host on repl.it, but this should not have any effect, because this script alone is running well individually on desktop PC.</p>
  <p>I've tried my best to figure out the cause of this error, but with no success so far.</p>