[Mailman-Users] non-subscribers getting through--email address in "Real Name"

[Jayson Smith]

Hi,

Both of these approaches seem to be specific to Postfix if I'm not 
mistaken. There's a similar milter for Sendmail called Mailman-Milter 
which I was using for a while. However, it worked based on Mailman's 
action E.G. it would use a Python script to determine what Mailman would 
do with a particular sender's mail for a particular list. If the answer 
was reject or discard, the incoming message got rejected at the SMTP 
data stage. This meant the list owner had to set up Mailman to reject or 
discard mail from non-subscribers. Unfortunately when I upgraded to 
Debian 9 from CentOS 6, Mailman-Milter broke somehow, and I don't 
understand the code well enough to figure out why. It also hasn't been 
updated in quite some time, and has virtually no documentation.

Could either of these milter solutions linked previously be adapted for 
use as a Sendmail milter? I'd love to find something which would query 
Mailman about the status of a particular sender address at the RCPT 
stage of the SMTP transaction so spoofed mail can be rejected right 
away, however, this might not be possible for one reason or another. Any 
thoughts would be appreciated.

Thanks,

Jayson

On 7/19/2018 2:55 PM, Jim Popovitch via Mailman-Users wrote:
> On July 19, 2018 6:53:52 PM UTC, Jim Popovitch <jimpop at domainmail.org> wrote:
>> On July 19, 2018 5:28:24 PM UTC, Mark Sapiro <mark at msapiro.net> wrote:
>>> On 07/19/2018 08:02 AM, Grant Taylor via Mailman-Users wrote:
>>>> I have often wondered about enhancing Mailman, or augmenting it with
>>> a
>>>> milter, to be able to test the SMTP envelope from, to, and body
>>> content
>>>> against list parameters and be able to reject messages during the
>>> SMTP
>>>> delivery transaction.
>>>
>>> You might be interested in
>>> <http://ftp.tummy.com/pub/tummy/tummailmanmember/>.
>> Here's an alternate take on the same thing that I wrote a couple years
>> back.
> With link this time!
>
> https://code.launchpad.net/~jimpop/mailman/check_subscriber
>
> -Jim P.
>
>
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