FAQ

Mark Sapiro wrote:
.. you said when you receive duplicates, the list was
addressed twice in the post, once in To: and once in Cc:. Thus, I am
suggesting that the list actually receives the post twice and sends
it twice and that's why you get two copies.
I mis-spoke. It only occurs in that one list when someone CC's the list. I
would understand if it were in both TO _and_ CC. Since all lists and MUA's
are different, people don't know whether to Reply or Reply-All, so it's
50/50 whether the list address will be in the TO _or_ CC, but most people
know to not double up.

There may be something here with digests too, but I don't think so.
I have not asked about digests but I don't think I'll find anything there
either.

The process of your not getting a dup when I address my reply to both
you and the list IS a Mailman process. You only get the direct message
from me because you have requested no dups, and Mailman sees your
address in the To: of my post so it doesn't send to you.

This is not the case on the other list where maybe the list receives
the post twice.
Remember that I am not involved in the discussions where I get the dupes.
I understand the mailman code filters possible dupes when TO = a
subscription address.

I have confirmation from a single Outlook user that I get dupes when they
do not. (I wish I had a larger sampling of responses over a longer period
of time but I'll take what I can get.) This points to an MTA issue and not
list or MUA. I am now checking in that area. Again the problem is that I
only get dupes to this one address when the list is in the CC. I can't
believe an MTA bug would be that specific so it might be some timing issue,
a hiccup during greylisting processing, etc.


I don't think it's Mailman per se, but I can't be sure without knowing
what is happening. I still think it could be actually two copies of
the post reaching the list, but the fact that no one else on the list
admits to receiving dups makes this seem unlikely. I would like to
help you get to the bottom of this if I can.

I think the next thing is to collect both copies of some duplicated
posts with full headers and examine the Received: chains in each to
try to determine where the duplication is occurring. If you need help
with this, you can post headers from duplicated posts to this list or
send them to me off list, and I will try to help.
Over the last month or two I have been going over the headers myself and
the headers on each copy of the mails are exactly the same: same Received
path and time stamps, and same Message-ID (!!). The only pattern between
what generates dupes and what does not is that the list address is in the
CC of duped mails - but only on that list, not in this mailman-users list.
:(

Please allow me a few days to pursue the MTA route and I'll post a note
here to let you know if I find anything. Based on your comments and info
from the other list I'm fairly convinced that I shouldn't be wasting any
more of your collective time. But I will let you know what I find out.

Thank you kindly for your dedicated interest.

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postedApr 30, '06 at 8:28a
activeMay 17, '06 at 10:49p
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