On Thu, Jul 31, 2014 at 1:06 AM, Noel Butler <noel.but...@ausics.net> wrote:
> There is no such thing as 'too big' when it comes to handling the shit storm > of spam that gets spewed out of some organisations, and I'll treat Gmail and > the likes the same as a ma 'n pa run outback country dialup ISP, there is At dnswl.org we use two measures that may be helpful in this context. The first is the magnitude of a sender as we observe it. A magnitude of 10.0 represents 100% traffic, 9.0 10%, 8.0 1% and so on. The other is the magnitude of "spamminess". This is an artificial measure which indicates the relative "spamminess" of a particular DNSWL record (based on the number of days it's IPs have been on certain blacklists with a certain weight for each blacklist, number of abuse reports we receive etc). Both numbers are not fully accurate, but at least the error is consistent. For the examples of Yahoo and Google often cited, by "spamminess" they are ranked at number 173 and 174 (yes, by chance just side-by-side). By their sender magnitude, they are placed at number 1 and 2 (Google with considerable distance to Yahoo, followed by Mailchimp, Hotmail and Facebook). Note that the "spamminess magnitude" is _not_ a direct measure of "number of spam sent". Blocking Yahoo or Google based on their spamminess is actually not justified. Taken together with their sheer size makes them a noticeable problem - but if the SMTP traffic would come out from other, less well-managed networks, the situation could actually be worse. -- Matthias For stats freaks: Top Senders by Monthly Magnitude with Spamminess: google.com 8.55 7.26 yahoo.com 8.15 7.26 mailchimp.com 8.13 6.84 hotmail.com 8.07 7.04 facebook.com 8.02 6.48 exacttarget.com 7.95 5.82 amazonses.com 7.86 6.01 outlook.com 7.87 6.88 * sendgrid.com 7.87 6.30 linkedin.com 7.83 5.68 cheetahmail.com 7.76 5.68 messagelabs.com 7.68 5.92 twitter.com 7.54 none ** emailvision.com 7.56 7.17 constantcontact.com 7.59 6.19 responsys.com 7.48 5.55 emarsys.net 7.36 6.60 silverpop.com 7.45 5.86 postini.com 7.43 5.95 *** * Can be considered jointly with hotmail.com ** We discard spamminess < 5.0 due to the tiny numbers and low reliability *** Can be considered jointly with google.com The "Top Spamminess" report is not intended for publication, as we don't want to "name&shame" (and there is still some cleanup to do on our end). Rank 100 in the top spamminess report has a spamminess magnitude of 7.48.
