From: Noel Jones (no email)
Date: Tue Jan 15 2008 - 11:17:02 EST
Charles Marcus wrote:
> Noel Jones, on 1/15/2008 10:53 AM, said the following:
>> You might want to use
>> # main.cf
>> smtpd_hard_error_limit = 4
>> in order to limit the number of invalid addresses a client can try
>> before postfix disconnects.
>> http://www.postfix.org/postconf.5.html#smtpd_hard_error_limit
>
> Interesting... this looks like a good thing to implement - what would be
> the downsides (if any)?
>
> Thanks,
>
Legit mail addressed to multiple invalid users plus some legit
users may be (significantly) delayed, but no mail should be lost.
The default value for smtpd_hard_error_limit is 20, which is
reasonable. Sites with a large number of frequently changing
users (hundreds of thousands) may want to increase this; small
sites with a fairly static user list (tens to maybe low
hundreds of users) can reduce this to maybe as low as 2 or 3
without noting any ill effects.
-- Noel Jones
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