Note: the appropriate list for MM 3 is mailman-us...@mailman3.org
On 10/24/24 04:13, Ralf Hildebrandt via Mailman-Users wrote:
Hi!
We're running postfix-us...@postfix.org and we're encountering an odd
problem: A system is sending mailing list messages that were posted on
postfix-us...@postfix.org BACK to postfix-us...@postfix.org
And these mails simply pass moderation (which is set to the following):
Default action to take when a member posts to the list: Default processing
Default action to take when a non-member posts to the list: discard (no
notification)
The headers of the mail (which I put on hold, based on the IP of the
sending system):
Date: Thu, 24 Oct 2024 11:13:01 +0200
To: postfix-us...@postfix.org
Message-ID:
In-Reply-To:
X-MailFrom: ge...@hendrickx.be
X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency;
loop; banned-address; member-moderation;
header-match-postfix-users.postfix.org-0; nonmember-moderation;
administrivia; implicit-dest; max-recipients; max-size; news-moderation;
no-subject; digests; suspicious-header
X-Mailman-Version: 3.3.9
Precedence: list
Content-Type: text/plain; charset="us-ascii"
Message-ID-Hash: Z6I2WZCEBC6PUKLVOEVAW3ZU2CDR47AW
X-Message-ID-Hash: Z6I2WZCEBC6PUKLVOEVAW3ZU2CDR47AW
X-MailFrom: t...@turbopush.cn
X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency;
loop; banned-address; member-moderation;
header-match-postfix-users.postfix.org-0; nonmember-moderation;
administrivia; implicit-dest; max-recipients; max-size; news-moderation;
no-subject; digests; suspicious-header
Subject:
=?utf-8?B?W+WklumDqOmCruS7tl1bcGZ4XSBb5aSW6YOo6YKu5Lu2XVvlpJbpg6jpgq7ku7ZdUmU6IE9wZW5TU0wgY29tcGlsZSB2cy4gcnVudGltZSB2ZXJzaW9uIHdhcm5pbmc=?=
From: Geert Hendrickx via Postfix-users via Postfix-users
Reply-To: Geert Hendrickx ,
Geert Hendrickx via Postfix-users
So, it's the mail from "Geert Hendrickx" being resent from
t...@turbopush.cn -- the headers have both
"X-MailFrom: t...@turbopush.cn" (not a member of the list) and
I think this is the envelope sender of this message
"X-MailFrom: ge...@hendrickx.be" (definitely a member of the list)
and I think this is the envelope sender of the original message that was
bounced back.
Why is the mail being accepted?
Because ge...@hendrickx.be is in the list returned by
mailman.email.message.Message.senders and is a list member presumably
with moderation_action Default Processing. In this case it is because
ge...@hendrickx.be is in Reply-To:.
If I am correct about 5the envelope sender, the full list returned by
the senders method is
```
['postfix-us...@postfix.org', 't...@turbopush.cn', 'ge...@hendrickx.be']
```
being respectively From:, envelope sender and Reply-To:
From: doesn't look right (since it says "postfix-us...@postfix.org")
We're currently stopping these mails, but I think mm3 is not acting
correctly here (unless we're missing something)
List membership is determined by much more than From:. See
https://gitlab.com/mailman/mailman/-/blob/master/src/mailman/email/message.py?ref_type=heads#L87-L107
If you want list membership to be determined solely by From:, you need
to put
```
sender_headers: from
```
in the `[mailman]` section of mailman.cfg. If you just want to drop
Reply-To, you can use
```
sender_headers: from from_ sender
```
--
Mark Sapiro The highway is for gamblers,
San Francisco Bay Area, Californiabetter use your sense - B. Dylan
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