[erlang-questions] : : My messages don't appear in the mailing-list

Raimo Niskanen <>
Thu Apr 3 14:09:21 CEST 2008

On Thu, Apr 03, 2008 at 09:16:50PM +1100, jm wrote:
> Raimo Niskanen wrote:
>   > Yes. The server uses greytrapping as a spam defense. And for
> > large SMTP farms with few subscribers (to our maling lists)
> > it does not work that well automatically. Your mails arrive
> > from many different mail hosts, and since one particular
> > mail can be resent from a different host, the mail hosts
> > have a hard time getting whitelisted. And that is why
> > some mails get through instantaneouly and some not.
> > If there were many subscribers to erlang-questions from
> > your SMTP farm all hosts would become whitelisted with ease,
> > and the problem would disappear. It disappears now
> > too, but it takes time.
> > 
> > I have made all your SMTP farm hosts permanently approved.
> > Thank you for pointing this out.
> > 
> > Anyone else with the same problem let me know!
> > 
> What are you using for a mail server? I'm using postfix for a mail 
> server at an ISP and at one stage started writting a postfix policy 
> server in erlang with mnesia support to allow grey listing to work 
> correctly across multiple servers. It was shelved early on. Might be 
> time to drag it out and take another look.

The machine is running OpenBSD so it uses sendmail. Greylisting is
done by OpenBSD's spamd, and it can as far as I know collaborate
across multiple hosts. Spamd uses the packet filter to route
whitelisted hosts to sendmail and talks itself to the greylisted.
It is also written to handle many connections efficiently.

Take a look at:
and related before dragging out your old project.

> Jeff.
> _______________________________________________
> erlang-questions mailing list
> http://www.erlang.org/mailman/listinfo/erlang-questions


/ Raimo Niskanen, Erlang/OTP, Ericsson AB

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