Thunderbird and Efail

neandr neandr at
Wed May 16 06:43:30 UTC 2018

Would it makes sense to have an easier  method to switch between Simple 
and Original HTML? Maybe a toggle button on the message header area.

Also how about the other note to render/display the Orignal html 
formatted message with an other program which would have no mail access?


On 16.05.18 02:59, Ben Bucksch wrote:
> Nomis101 🐝 wrote on 16.05.18 01:31:
>> I assume the S/MIME implementation is affected from Efail? Is this a
>> serious issue for all Thunderbird users who are relying on S/MIME (and
>> sending HTML emails)?
> Yes.
> That said, the attack is an active MITM attack. The attacker needs to 
> modify your emails. You can also detect it. So, it's a crude attack 
> from an attacker's viewpoint.
> Good news is that it's simple to mitigate. Simply enable View | 
> Message Body as | Simple HTML, and the attack will no longer work. 
> This feature neutralizes the attack in 2 different ways. If security 
> is important to you, you should enable that anyways, as it neutralizes 
> whole classes of attacks.
> Ben
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