McColo and SPAM

Paul Kelly :: Blacknight paul at
Sat Dec 6 07:10:12 UTC 2008

We saw a dramatic decrease. Attached is our dnsbl mirror in .ie, it mirrors spamhaus amoungst other things.

The numbers are in 1000s of 1000s per 5 minute window. (so 2500k = 2.5m)

You can see a dramatic decrease that corresponds with them going offline and then the spam level gradually coming back, but it's certainly not back full tilt yet.


Paul Kelly
Technical Director
Blacknight Internet Solutions ltd
Hosting, Colocation, Dedicated servers
IP Transit Services
Tel: +353 (0) 59 9183072
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Blacknight Internet Solutions Ltd,
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Company No.: 370845
From: Frank Bulk [frnkblk at]
Sent: 06 December 2008 03:33
To: 'Peter Serwe'; Skywing
Cc: nanog at
Subject: RE: McColo and SPAM

We experienced exactly no decrease with the McColo shut down a few weeks
back, even though we receive 2M+ messages per day.  It's interesting that
each service provider's spam populations are as different as they are.  Some
experienced gigantic decreases, others didn't.  And it's not like we have
just one domain.

I know MessageLabs examines spam rates per industry type.


-----Original Message-----
From: Peter Serwe [mailto:peter.serwe at]
Sent: Friday, December 05, 2008 2:57 PM
To: Skywing
Cc: nanog at
Subject: Re: McColo and SPAM

Certainly, I have seen a perceptual, yet completely subjective increase.

I know major operators who have claimed to see a gigantic decrease.


On Fri, Dec 5, 2008 at 12:51 PM, Skywing <Skywing at>
> McColo hosted the command and control servers for spam botnets and didn't
originate spam directly, at least primarily, according to my understanding.
> - S
> -----Original Message-----
> From: Peter Serwe [mailto:peter.serwe at]
> Sent: Friday, December 05, 2008 3:49 PM
> To: nanog at
> Subject: Re: McColo and SPAM
> On Fri, Dec 5, 2008 at 11:34 AM,  <nanog-request at> wrote:
>> Message: 1
>> Date: Fri, 05 Dec 2008 20:14:08 +0100
>> From: Revolver Onslaught <revolver.onslaught at>
>> Subject: McColo and SPAM
>> To: nanog <nanog at>
>> Message-ID: <49397D80.701 at>
>> Content-Type: text/plain; charset=ISO-8859-1
>> Hello,
>> Since McColo closed, we noticed the spam was far more intensive than
>> However, it seems the amount of spam is similar than than before.
>> Do you feel the same ?
>> Many thanks,
>> RO
> It would seem that the sources of SPAM have merely moved since McColo
> was shut down and it's going to
> take some time for everyone's blackhole routes and RBL's to catch up.
> I have personally noticed a higher
> delivered spam content in my own email accounts.
> Peter
> --
> ピーター


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