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Re: [ietf-dkim] 8bit downgrades

2011-05-22 23:37:43
Alessandro Vesely wrote:

For example, MTAs that autoconvert from quoted-printable to 8bit, a
rather common circumstance.

I did the following Content-Transfer-Encoding failure analysis:

     Failure rates for message top level encoding type
+--------------------------------------------------------+
| enctype               total       bodyfail     pct     |
|--------------------------------------------------------|
| 8bit                  31          25           80.6    |
|                       5461        1236         22.6    |
| binary                5           1            20.0    |
| quoted-printable      1188        179          15.0    |
| base64                32          3             9.3    |
| 7bit                  1465        106           7.2    |
+--------------------------------------------------------+

Based on my PCN, 8bit does have a high rate of failure, but they are a 
very small amount of the grand total.  The encoding types; QP, base64 
and 7bit offers the better lower failure rate.  Except for the 3 
base64 fails, but I can't tell if they originated that way or not. I 
will take a SWAG that these represent direct messages and were not 
going thru a list.

It would be interesting to see what Murray can show for his volume 
collection.

-- 
Hector Santos, CTO
http://www.santronics.com
http://santronics.blogspot.com


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