SMTP problem

Whenever I send an eamail to any list, the system tells
me, the mail has been sent, the mailman archive of the
list shows me the sent mail, but mailman doesn't send
it out to the users. It keeps it in shunt dirrectory
and whenever it tries to send it (like when unshunt
invoked), I get something like this in error:

Oct 07 00:53:34 2005 (20276) SHUNTING:
1128638415.450326+e1e70fc6df2adac2d6b625e2519b601c8879bacb
Oct 07 01:06:13 2005 (31706) Uncaught runner exception:
SMTP instance has no attribute 'sock'
Oct 07 01:06:13 2005 (31706) Traceback (most recent
call last):
File
"/tmp/B.30a581/mailman-2.1.5-root-builder/var/lib/mailman/Mailman/Queue/Runner.py",
line 111, in _oneloop
File
"/tmp/B.30a581/mailman-2.1.5-root-builder/var/lib/mailman/Mailman/Queue/Runner.py",
line 167, in _onefile
File
"/tmp/B.30a581/mailman-2.1.5-root-builder/var/lib/mailman/Mailman/Queue/OutgoingRunner.py",
line 73, in _dispose
File
"/tmp/B.30a581/mailman-2.1.5-root-builder/var/lib/mailman/Mailman/Handlers/SMTPDirect.py",
line 152, in process
File
"/tmp/B.30a581/mailman-2.1.5-root-builder/var/lib/mailman/Mailman/Handlers/SMTPDirect.py",
line 362, in bulkdeliver
File
"/tmp/B.30a581/mailman-2.1.5-root-builder/var/lib/mailman/Mailman/Handlers/SMTPDirect.py",
line 68, in sendmail
File
"/tmp/B.30a581/mailman-2.1.5-root-builder/var/lib/mailman/Mailman/Handlers/SMTPDirect.py",
line 62, in __connect
File "/usr/share/python2.4/smtplib.py", line 255, in
__init__
AttributeError: SMTP instance has no attribute 'sock'

Oct 07 01:06:13 2005 (31706) SHUNTING:
1128638415.450326+ff5f438f835639afd9d59480cebaf2e1b400eff1

python 2.4.2 installed