postfix delay

[Steen, Glenn]

Thanks Drew. Thought so, but it's always better to have more than one
pair of eyes....:)

I found a lot of the anti-UCE docs on http://www.postfix.org/docs.html
to be very helpful, especially John Seymours
http://jimsun.linxnet.com/misc/postfix-anti-UCE.txt
... And some nice rtfm on the smtpd_*_restrictions settings:-).

-- Glenn

> -----Original Message-----
> From: MailScanner mailing list 
> [mailto:MAILSCANNER at JISCMAIL.AC.UK] On Behalf Of Drew Marshall
> Sent: den 17 februari 2005 12:19
> To: MAILSCANNER at JISCMAIL.AC.UK
> Subject: Re: postfix delay
> 
> 
> On Thu, February 17, 2005 9:33, Steen, Glenn said:
> > I'm sure that Drew Marshall (or someone else more knowledgeable than
> > lil' ol' me) can confirm/deny this, but AFAIK there is no 
> such feature
> > as the sendmail 8.13.1 greet_pause in postfix (Yet... I've looked
> > mainly at 2.1 docs).
> > -- Glenn
> 
> You are right, there isn't a greet_pause function in Postfix. 
> I think the
> view is that delying SMTPd connections just uses up SMTPd 
> daemons, which
> will then be 'held open' until they time out (As set with 
> smtpd_timeout,
> default is 300s) and with a flood of mail you would run out of SMTPd
> processes. You could increase them in master.cf but then run 
> the risk of
> killing your machine having over used resources.
> 
> The closest you get is the smtpd_soft_error_limit which adds a delay
> (Default 1s) to smtp connections that make x many errors (Default 10)
> during one connection and indeed the smtpd_hard_error_limit 
> (Default 20)
> which will disconnect if the number of error continues but 
> this won't help
> spam, only directory or relay attacks.
> 
> There are other ways to reduce your spam at Postfix level. I would
> recommend having a read of 
> http://www.postfix.org/postconf.5.html (Scroll
> down to the sections starting 'smtpd_') which gives you all 
> the options.
> 
> Drew
> 
> >
> >> -----Original Message-----
> >> From: MailScanner mailing list
> >> [mailto:MAILSCANNER at JISCMAIL.AC.UK] On Behalf Of David Curtis
> >> Sent: den 16 februari 2005 20:13
> >> To: MAILSCANNER at JISCMAIL.AC.UK
> >> Subject: postfix delay
> >>
> >>
> >> I was following some of the mail flow regarding putting a pause in
> >> postfix to help curb some spammers. I think I lost some
> >> information some
> >> where.
> >>
> >> I would like to know the command and where to place the
> >> command to have
> >> postfix pause when accepting a message.
> >>
> >> Thanks.
> >>
> >>
> >>
> >>
> >>
> >>
> >>
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