[Mailman-Users] Forged from headers and non existent lists

[Hans Ulrich Niedermann]

stupidmail4me <stupidmail4me at yahoo.com> writes:

> My site is getting a lot of spam sent to my lists.
> They are being sent from unknown people using forged
> from headers. Mailman then sends an email to these
> forged from headers telling them so and so list
> doesn't exist. Most of these forged from headers
> aren't real addresses, so there begins loops of
> mailman trying to send out a message, and their email
> servers telling mine that address doesn't exist.
>
> Is there an option in Mailman to just disregard
> messages sent to lists that don't exist? I don't want
> to send a message informing them that the list doesn't
> exist, I just want Mailman to ignore it. Is this
> possible?

Why does Mailman receive those mails in the first place?

There should be no valid alias for those non-existing lists and the
MTA thus should not accept those mails at all. If the MTA just returns
a SMTP error "no such user", no additional mails are generated.

Gruß,

Hans Ulrich Niedermann