Bug#851214: images attached to emails are embedded with task=1 instead of task=mail

[Michael Laß]

Hi,

this is a duplicate of #843795. The workaround shown here would actually revert 
parts of a critical security fix for CVE-2016-4069. Instead, the solution 
mentioned in #843795 should be implemented and pushed via Wheezy LTS.

Cheers,
Michael