[afnog] spam filter for smtp

[Ismail M. Settenda]

Dear Chris,

Ordinarilly you wouldnt have too but we found the delay was much more than
15 mins and this was cause after the initial greeting/first attempt then
lets say google's mail server would switch and then make the attempt from
another smtp server. So as far as the greylist was concerned this was a new
connection and the whole process would start all over.

This is then why I was trying to manually add the said servevrs or domain in
the greylist database.

K, will do and give it another try.

Regards

--
Ismail


On Tue, Jun 15, 2010 at 10:10 AM, Chris Wilson
<chris+afnog at aptivate.org<chris%2Bafnog at aptivate.org>
> wrote:

> Hi Ismail,
>
> On Tue, 15 Jun 2010, Ismail M. Settenda wrote:
>
> > The thing with greylisting is I failed to auto add sites like google and
> > yahoo who use and keep changing outgoing servers to balance load (cant
> > find the url with the how-to).
> >
> > I then had to keep manually adding these smtp servers and couldnt keep
> > up the pace and was also tedious...thus the move to policyd-weight which
> > also blocks alot more stuff before it hits postfix or amavis and thus
> > improves processing of emails as well.
>
> Firstly, you don't have to add them at all. They will pass greylisting. So
> some emails from Google and Yahoo get delayed by 15 minutes. Big deal.
>
> Secondly, you could join Jaco Kroon's distributed greylist to share the
> work of learning these servers across many sites and emails:
>
>  http://www.mail-archive.com/exim-users@exim.org/msg33805.html
>
> Thirdly, I get just as good results from rejecting bogus or dynamic HELOs
> as I do from greylisting, so you could drop greylisting entirely.
>
> For more information, check out my presentation:
>
>  http://www.exim-new-users.co.uk/Chris-Wilson-Aptivate-Reducing-Spam.pdf
>
> Cheers, Chris.
> --
> Aptivate | http://www.aptivate.org | Phone: +44 1223 760887
> The Humanitarian Centre, Fenner's, Gresham Road, Cambridge CB1 2ES
>
> Aptivate is a not-for-profit company registered in England and Wales
> with company number 04980791.
>
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