full-disclosure - CSS in E-Mails possible E-Mail-Validity Check for Spammers?

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Message-ID: <41889C63.2070608@doxdesk.com>
From: and-bugtraq at doxdesk.com (Andrew Clover)
Subject: CSS in E-Mails possible E-Mail-Validity Check
 for Spammers?

plonk@...enritter.de wrote:

> Mozilla Mail 1.7.1 (W98) and 1.7.3 (W98) (didn't check different 
> versions) automatically load CSS-files which are linked from within an 
> html-page sent in an e-mail

Yes. There have been other ways to force an HTTP request from HTML mail 
too (eg. background images, bug 239954) so this is not unexpected.

The "block loading of remote images in mail messages" option isn't 
waterproof from a privacy point of view. It would be nice if it was, but 
I'm not sure this is actually Mozilla's goal; perhaps worth filing a bug 
to force the issue?

> - turn off HTML in E-Mails (not possible in Mozilla?)

Should be possible - it is in Thunderbird (View->Message Body as->Plain 
Text) and I highly recommend doing so.

-- 
Andrew Clover
mailto:and@...desk.com
http://www.doxdesk.com/