postfix delay

[Steen, Glenn]

Wrote my own variants (that keep the pesky "internal M-Sexchange"
addresses and various others (internal "booking" type addresses)
from being valid externally) long before I saw the MAQ suggestions;-).

-- Glenn

> -----Original Message-----
> From: MailScanner mailing list 
> [mailto:MAILSCANNER at JISCMAIL.AC.UK] On Behalf Of Pete Russell
> Sent: den 17 februari 2005 13:10
> To: MAILSCANNER at JISCMAIL.AC.UK
> Subject: Re: postfix delay
> 
> 
> Assuming your machine is a mail relay for another mail 
> environment, like
> exchange, think about using the scripts from the MAQ to only 
> accept mail
> for VALID users of your email environment.
> 
> Drew Marshall wrote:
> > 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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