postfix delay

[Pete Russell]

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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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