backscatter by DSN: Service unavailable

Glenn Steen glenn.steen at
Thu Jan 31 10:48:16 GMT 2008

On 31/01/2008, Ronny T. Lampert <telecaadmin at> wrote:
> >> The quickest solution is to try and reduce the bounces by doing some
> >> kind of milter-ahead solution; this will maybe reduce the backscatter by
> > I thought milter ahead will reduce backscatter from DSN send because of
> > not existing wrong rcpt to: messages (Am I wrong here?).
> > Those are not the problem at the moment.
> > I get spammy non-conformous mail_from domains (valid A record , invalid MX) that
> > my sendmail 8.13.8 relays but other postfixes may not. Also DNS name resolution
> > might differ between different servers.
> Only partially wrong :)
> With milter-ahead you can reduce the backscatter of mail from: <...>
> rejections, because you will first ask the accepting mail server "will
> you accept a mail, from: -> to: ?".

Exactle, in this situation, whatever is done to reduce the total
amount of backscatter will be a Good Thing(tm).

> Or you could just ditch sendmail and use postfix with a similar
> rejection policy instead?

You and I know the Superior Power of Postfix, but airing it like
this... This is the way flamewars start, you know Ronny...?:-)

> Cheers,
> Ronny
Indeed, cheers ... :)
-- Glenn
email: glenn < dot > steen < at > gmail < dot > com
work: glenn < dot > steen < at > ap1 < dot > se

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