4.40.5: IPBlock 451 versus 550

[Rakesh]

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thanks Jeff,

test it on real time scenarios and suggest what would help to make
things better and easier. Even I have implemented it on my live servers.
Probably one thing down the line we have to do is by default maintain a
list of some well known outgoing servers of yahoo or other heavy traffic
outgoing servers and set them to have a greater connection limit
(specify greater limits for them in IPBlock.conf). That we have to see
if it would really help others.  What do you think on this ? Julian
please let us know your views as well.

Rakesh

Jeff A. Earickson wrote:

> Rakesh,
>    Point taken.  I have changed my CustomConfig.pm back to using 451
> instead of 550.  I'll see if the problem returns.  Hey, this is
> a beta version of MailScanner and those of us who run it should
> be willing to test the new features.
>
> Jeff Earickson
> Colby College
>
> On Thu, 17 Mar 2005, Rakesh wrote:
>
>> Date: Thu, 17 Mar 2005 18:30:35 +0530
>> From: Rakesh <rakesh at NETCORE.CO.IN>
>> Reply-To: MailScanner mailing list <MAILSCANNER at JISCMAIL.AC.UK>
>> To: MAILSCANNER at JISCMAIL.AC.UK
>> Subject: Re: 4.40.5: IPBlock 451 versus 550
>>
>> Jeff A. Earickson wrote:
>>
>>> Julian,
>>>
>>> Just curious as to why you changed IPBlock from fatal rejections
>>> to tmpfail.  I've had a couple of spammers pounding on my system
>>> with crap that would have ordinarily been booted by IPBlock for
>>> good.  Now they just keep trying.  I've modified my copy of
>>> CustomConfig.pm in 4.40.5 to do the 550 rejections again.
>>
>>
>>
>> my idea of suggesting Jules for 451 error instead of 550 error code was
>> that, unknowingly we do not bounce back some geniune mails just because
>> the sending server is sending too many mails to us. For e.g. a yahoo's
>> outgoing server might be sending quite a good amount of mails to an MX
>> server hosting many domains. So if we just temporarily deny from
>> accepting the mail then however i am quaranteed that a good outgoing
>> server would definitely try again for delivery which won't be applicable
>> incase of a 550 rejection and probably some sending out an important
>> mail would finally get a bounce back for no good reason. This totally
>> different from the greylisting concept in which any server initiating a
>> first time connections will have to compulsarily try again later.
>>
>> However majority spammers use hijacked machines or poor SMTP engines to
>> send out spams and asking them to try again later with 451 error code
>> wouldnt be of any harm as they don't bother to try again later so the
>> spams doesn't come at all. However if they are using someone else's
>> server which actually does retry sending the spam, then we can probably
>> notify the administrator to checkout his system or atleast have 1 hour
>> to block the IP on the firewall.
>>
>> --
>> Regards,
>> Rakesh B. Pal
>> Emergic CleanMail Team.
>> Netcore Solutions Pvt. Ltd.
>>
>> ========================================================================
>> "First they ignore you. Then they laugh at you.
>> Then they fight you. Then you win."
>>                                               - M. Gandhi
>> ========================================================================
>>
>>
>>
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--
Regards,
Rakesh B. Pal
Emergic CleanMail Team.
Netcore Solutions Pvt. Ltd.

========================================================================
"First they ignore you. Then they laugh at you.
Then they fight you. Then you win."
                                                - M. Gandhi
========================================================================

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