Am 22.03.2013 18:15, schrieb A.L.E.C:

On 03/22/2013 04:24 PM, Manfred Usselmann wrote:

1. Do not list any in text and html mode (current situation). 
2. List only unreferred in text and html mode. 
3. In text mode list all, in HTML mode list unreferred only (Thunderbird's way).

What's the difference between 2. and 3.? Can you refer images in text mode?

No, you can't of course. The difference is that in 2. we list only
images that aren't referred anywhere. We do not list images that are
referred by HTML part, no matter if we display the message in text or
html mode.

Thanks.

I would prefer 3. 

Manfred