4.40.5: IPBlock 451 versus 550

[Steen, Glenn]

> -----Original Message-----
> From: MailScanner mailing list 
> [mailto:MAILSCANNER at JISCMAIL.AC.UK] On Behalf Of Jan-Peter Koopmann
> Sent: den 17 mars 2005 10:14
> To: MAILSCANNER at JISCMAIL.AC.UK
> Subject: Re: 4.40.5: IPBlock 451 versus 550
> 
> 
> On Wednesday, March 16, 2005 6:41 PM David Lee wrote:
> 
> > I note that Mirapoint (www.mirapoint.com) has a feature called
> > MailHurdle which deliberately uses 4xx-like temporary 
> failures to try
> > to stall spammers.  
> 
> Unless I misunderstand something here this method is calles 
> greylisting and is many things but new. Should be installed 
> on the MTA however and not in MailScanner. There are many 
> guidelines and packages for all important MTAs. It is 
> generally very effective but has a big problem at least for 
> commercial clients:
> 
> > By contrast, legitimate email (yes, and some residual spam) would
> > always try again a few minutes later, and so when it does, this time
> > the call is accepted ("I've just met you, so I accept you 
> 200-like").
> 
> The problem is "a few minutes". Depending on how the sending 
> MTA is setup, this can be anything. The default for many MTAs 
> is 15 minutes, but if the Administrator chose 60 minutes etc. 
> this means that the first message will take at least 60 
> minutes to be delivered. This is not acceptable for most 
> business users I have met.
> 
> Regards,
>   JP
I suspect the greeting pause feature of sendmail 8.13.1 would have
pretty much the same effect, no? As in "countermeasure using the
fact that it isn't a real MTA in the other end"...

-- Glenn

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