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On my system, running the simple smtplib Example
from the Documentation results in a segmentation fault.
Execution stops and no mail is submitted.
I debugged into the Python source code, but my
understanding of the inner mechanisms doesn't
suffice to fix the problem.
I update my system periodically using "apt-get update ;
apt-get upgrade". I don't remember, when it was the last
time Python was upgraded.
I made the files availabe:
http://www.bertram-scharpf.de/tmp/smtpex.py.txt
http://www.bertram-scharpf.de/tmp/smtpex.desc.txt

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I cannot reproduce this.
I've tested: 
Python 2.3 (#1, Sep 13 2003, 00:49:11) 
[GCC 3.3 20030304 (Apple Computer, Inc. build 1495)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
Python 2.3.4 (#2, Jul 5 2004, 09:15:05) 
[GCC 3.3.4 (Debian 1:3.3.4-2)] on linux2
Python 2.2.3+ (#1, Jun 20 2004, 13:32:48) 
[GCC 3.3.4 (Debian)] on linux2
The first is the system python on MacOS X, the other two are current 
Debian packages (python2.3 and python2.2) on Debian stable.

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Indeed, I did compile python 2.2.1 with Gcc versions 2.95,
3.0 and 3.3. The segfault only occurs in the 2.95 compiled code.

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Please, could you verify if this problem persists in Python 2.3.4
or 2.4?
If yes, in which version? Can you provide a test case?
If the problem is solved, from which version?
Note that if you fail to answer in one month, I'll close this bug
as "Won't fix".
Thank you! 
. Facundo

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> I'll close this bug as "Won't fix".
I think that's OK.

I just ran into this while using the smtplib example on:
2.6 (r26:66714, Jan 17 2012, 11:02:11)
GCC 4.1.2 20080704 (Red Hat 4.1.2-44)
Running the program simply gives a "Segmentation Fault (core dumped)"
Running it under gdb...
[Thread debugging using libthread_db enabled]
[New Thread 0x2b0257007b80 (LWP 2567)]
Program received signal SIGSEGV, Segmentation fault.
PyEval_EvalFrameEx (f=0x17701d00, throwflag=<value optimized out>) at Python/ceval.c:4342
4342 if (!PyDict_Check(gobals)) {

Could you please indicate exactly the command you're running, and provide the full backtrace?

The original poster's links are dead. Without a reproducible problem with a current release, there is nothing we can do. Anyone who can provide such and will respond to requests for more information can reopen.
Note:
On Win 7 with 3.2, 3.3, current example exits on line
 server = smtplib.SMTP('localhost')
with
socket.error: [Errno 10061] No connection could be made because the target machine actively refused it