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Postfix Archives: Re: selecting MX record -- ye olde battering

Re: selecting MX record -- ye olde battering ram?

Subject: Re: selecting MX record -- ye olde battering ram?
From: Ralf Hildebrandt (R.Hildebrandttu-bs.de)
Date: Tue Jan 04 2000 - 10:32:15 CST

On Tue, Jan 04, 2000 at 04:05:56PM +0000, Geoff Gibbs wrote:

> A colleague has just suggested that hamburg have a fire wall
> and that the "0" preference is behind it. If this is true, it appears

Then they'd normally block all traffic. But they permit a connection and
drop it afterwards. Perhaps a sendmail (or whatever they use) configuration
issue. Or that MX SHOULD be for internal use only, but somehow the data leak
out...

> that sendmail is working its' way through the preferences until it
> hits the mail server accessable from outside the firewall, when
> it gets the "520" reply, while Postfix is taking it as a hard failure
> and stopping.

Question: Using Wietse's patch, won't Postfix batter sites with multiple MX
records like crazy, trying to deliver mail - moving from one MX to the next
(just like that braindead spamware that keeps knocking at our door, trying
to get in) ? 

-- 
Ralf Hildebrandt <R.Hildebrandttu-bs.de> www.stahl.bau.tu-bs.de/~hildeb
For their next act, they'll no doubt be buying a firewall running
under NT, which makes about as much sense as building a prison out of
meringue.

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