[Mailman-Users] list address in From: line post message to closed list
steve at marmot.org
Thu Apr 3 23:43:16 CEST 2008
> Steve Lindemann sent the message below at 12:18 4/3/2008:
>> The problem - when the list email address is (spoofed) in the From: line
>> (as well as being on the To: line) the message posts to the list. The
>> ability to post to the list is supposed to be restricted to only list
>> members. The list address is not in the list of list members.
>> Is this normal? I checked the config and there did see anything to
>> allow this behavior there. Is the list email address automatically
>> considered to be a member of the list? I can always block it in
>> "privacy options->sender filters", but should that even be necessary? Help!
> ---------------- End original message. ---------------------
> This seemed rather strange to me too so I decided to test it on my
> server. I have 2.1.10b3 installed from source on a Redhat machine. My
> list is configured for posts from non-members to be discarded.
> I sent a message to one of my lists using the list address in the
> From: header. The message was discarded as I expected it would be and
> I confirmed this by an entry in the vette log.
> So it works on my installation as I expect it would. The question now
> is, what is the difference between my source install and your
> installation. Are you using a cPanel or Plesk version, or a version
> installed from somebody else's package maybe through yum or something similar?
> Are you certain that the message was distributed via the list?
> Is it in the list archive?
> Can you match the message ID to one in the post log?
> If you can see it in the archive and post log then it did get
> processed through mailman. If not, perhaps it was BCC'ed to your
> address or there is something else going on with your MTA.
I'm running version 2.1.9, installed from a tarball on a Dell server
running CentOS 5. I administer from the command line and thru the web
interface. It's a pretty basic install.
I went thru the logs and saw the message hit our email server
(originally from 5850-260-1-62.dialup.samtel.ru), it gets passed to
mailman and I see the post entry showing it's arrival into mailman then
then smtp entry showing it's delivery back to the email server. I
confirmed the delivery to the 144 recipients (fortunately this is a
small list) in the mail log. I am one of the recipients on this list,
but in my case spamassassin flagged the message and it gets filtered away.
I just widened my search thru the mailman logs and noticed some other
lists (in the vette log) holding messages for moderation with the list
email in the From: line. So it does appear to be something in this
specific list that's misconfigured. I'm off to poke around the config
again but I'd be very interested in any suggestions about what I might
be looking for!? My first pass thru the config I was looking for
something that would allow this to happen and didn't see it.
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