Dear Guix developers,

I had installed Guix several months ago, so I tried `guix pull' to 
update my packages. Everything went well for many packages and they were 
built.

However, one of the tests (`test_smtplib') in Python 2.7.11 didn't pass 
with the error below:

test test_smtplib failed -- Traceback (most recent call last):
   File 
"/tmp/guix-build-python-2.7.11.drv-0/Python-2.7.11/Lib/test/test_smtplib.py", 
line 222, in testHELP
     smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', 
timeout=3)
   File 
"/tmp/guix-build-python-2.7.11.drv-0/Python-2.7.11/Lib/smtplib.py", line 
256, in __init__
     (code, msg) = self.connect(host, port)
   File 
"/tmp/guix-build-python-2.7.11.drv-0/Python-2.7.11/Lib/smtplib.py", line 
317, in connect
     (code, msg) = self.getreply()
   File 
"/tmp/guix-build-python-2.7.11.drv-0/Python-2.7.11/Lib/smtplib.py", line 
365, in getreply
     + str(e))
SMTPServerDisconnected: Connection unexpectedly closed: timed out

For a full reference, I am also sending the full output of `guix pull' 
as an attachment.

Since the error is about connection, I should say that I was connected 
to the internet when I ran `guix pull'.

Because of this failure, I am unable to continue pulling the 
higher-level changes/packages. So, I wanted to see if there is anything 
particular I can do to fix this? Is this particular to my machine/system?

Thank you very much for all the great work on Guix,
Cheers,
Mohammad