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Re: rendering HTML: how to disable

From: Bernardo
Subject: Re: rendering HTML: how to disable
Date: Fri, 03 Apr 2015 19:22:58 +1100
User-agent: Gnus/5.13 (Gnus v5.13)

An old problem revisited

>>> LinkedIn etc) in their (HTML formatted) email
>>> include URLs which i suspect are used to track users
>>> when opening them
>> Try this:
>>     (setq mm-discouraged-alternatives '("text/html" "text/richtext"))
> ah, much better, thanks
>> Otherwise doesn't it work just by not following the
>> URLs?
> AFAICT the page pointed by URL is loaded as soon as soon as the message
> is opened, to the rejoicing of spammers

i still have an HTML formatted email which when opened makes connections
on the web; the email headers, among other things show this:

Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: quoted-printable

as it happens, i'm permanently running a home brewed (quick 'n' dirty)
script which monitors TCP connections, this is what it shows when
the offending email is viewed:

18:32:52  SYN          4434478
18:32:53  ESTABL    
18:32:53  ESTABL  
18:32:53  ------    
18:32:55  SYN          4434483
18:32:55  ESTABL    
18:32:56  ------    
18:33:01  ESTABL  

the Gnus variable mm-discouraged-alternatives value is:

mm-discouraged-alternatives is a variable defined in `mm-decode.el'.
Its value is ("text/html" "text/richtext" "image/.*")
Original value was nil

If i open another email message and go back to the offending one, the
TCP connections are established again.

But that's not all, i've this time, for a good measure, fired up
Wireshark and on opening the message it showed a two dozen DNS queries
(which go over UDP) for the domains that had "marketing" and "images" in
their name.

Guess just setting 'mm-discouraged-alternatives' is required but not
sufficient for preventing such behaviour. Any other ways from within
Gnus this could be prevented?

"GNU Emacs (i686-pc-linux-gnu, GTK+ Version 3.4.2) of
2015-03-08 on deb"

"Gnus v5.13"

Rgds, Bernardo

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