Re: [exim] DKIM, Mailing-lists and signing lengths

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Συντάκτης: Ian Eiloart
Ημερομηνία:  
Προς: W B Hacker, exim users
Αντικείμενο: Re: [exim] DKIM, Mailing-lists and signing lengths


--On 24 June 2010 08:50:08 -0400 W B Hacker <wbh@???> wrote:

> Ian Eiloart wrote:
>>
>>> --On 21 June 2010 19:12:56 -0400 W B Hacker <wbh@???> wrote:
>>>
>
> *trimmed*
>
>>> Roughly 32% - just under a third. HOWEVER ... one has to wonder how
>>> close the experience of a University is to the 'general case'.
>
> *trimmed*
>
>>
>> None of it was local mail. This isn't my MSA log. In general, the
>> traffic is from large well known service providers.
>>
>
> ACK. That makes a significant difference.
>
> One presumes the big 'n' public ISP's are major players.
>


Here's our top 40 sending domains that we've accepted email for in the past
few days. These are SMTP MAIL FROM domains. 15 of these domains also appear
in our top 50 domains DKIM using domains. 22 use SPF, 11 use both, and 3
(including us) use neither.

Of course, those domains that use both SPF and DKIM will get an
authentication hit for legitimate email, one way or the other. That's
because the pathways that break DKIM should be SPF safe, and vice-versa.

exigrep '<=' exim_mx_mainlog.2010-06-2* | eximstats -ne -nr -byedomain
* - also in our list of top 50 DKIM using domains
% - domain publishes SPF
Top 40 sending edomains by message count
----------------------------------------
  Messages      Bytes    Average   Sending edomain
*%      2987       11MB       3861   facebookmail.com
        1669     6851KB       4203   <>
*%      1292      218MB      173KB   gmail.com
 %      1037       47MB       46KB   jiscmail.ac.uk
*        778       51MB       67KB   returns.groups.yahoo.com
 %       759      205MB      277KB   hotmail.com
         719     1500KB       2136   sussex.ac.uk
*%       660       70MB      109KB   googlemail.com
*        543       93MB      175KB   yahoo.com
*%       446       22MB       51KB   bounces.amazon.com
*        347       49MB      145KB   yahoo.co.uk
 %       269     4555KB       17KB   ukrs238770.pur3.net
*%       266     4463KB       17KB   alerts.targetjobs.co.uk
*%       261     8567KB       33KB   in.constantcontact.com
*        254       23MB       93KB   btinternet.com
 %       252     3907KB       16KB   bounce.dbgi.co.uk
*%       241     5354KB       22KB   ebay.co.uk
*%       227     2139KB       9649   bounces.freecycle.org
 %       213     1263KB       6071   job-lin-mul-l01.eduserv.org.uk
         208     2391KB       11KB   lists.bham.ac.uk
 %       204       44MB      221KB   hotmail.co.uk
*%       192     7597KB       40KB   e3.emarsys.net
 %       158      708KB       4588   socialsciencesconference.com
 %       153       35MB      234KB   ids.ac.uk
*%       152     1380KB       9296   bounce.linkedin.com
 %       146     4414KB       30KB   cern.ch
*%       144     5427KB       38KB   googlegroups.com
 %       136       93MB      700KB   aol.com
 %       136     2339KB       17KB   bounce.exacttarget.com
         129     9006KB       70KB   bsms.ac.uk


--
Ian Eiloart
IT Services, University of Sussex
01273-873148 x3148
For new support requests, see http://www.sussex.ac.uk/its/help/