[Gllug] spamassassin v bogofilter
mimo at gn.apc.org
Thu Jun 2 13:53:44 UTC 2005
On Thursday 02 June 2005 14:43, Rich Walker wrote:
> Michael Moritz <mimo at gn.apc.org> writes:
> > On Thursday 02 June 2005 13:17, Jason Clifford wrote:
> >> On Thu, 2 Jun 2005, Michael Moritz wrote:
> >> > This is a misunderstanding. The receiving SMTP server (the one that
> >> > does the greylisting) reads the MAIL FROM, RCPT TO, and client
> >> > address, then checks the greylisting database and issues a 450. This
> >> > is before the DATA section of the SMTP session.
> >> You are trusting that all other MTAs and MUAs do the "right thing".
> >> Experience shows that this sometimes is not the case.
> > What do you mean? My SMTP server disconnects after the greylist check,
> > the session is ended. No way the sender can continue sending the mail
> > data as the tcp session is closed.
> The sender then drops the mail on the floor, or bounces it to the
> originator with an unhelpful message.
Thought this was about the reduction of mail server load, not weird MTA
> *This* is the problem with greylisting - critical upstream MTA's break
> when presented with it.
That is why you would whitelist them beforehand.
BTW, there is still a problem with this. What does one of these "critical
upstream MTAs" do when it is confronted with a genuine 4xx message? Does it
just lose the message, seriously? I think that's even more worrying than
> cheers, Rich.
> rich walker | Shadow Robot Company | rw at shadow.org.uk
> technical director 251 Liverpool Road |
> need a Hand? London N1 1LX | +UK 20 7700 2487
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