[imp] Can't read HTML message

[Jānis]

Citējot Michael M Slusarz <slusarz at horde.org>
Wed, 09 Nov 2011 14:29:48 -0700:

> Quoting Jānis <je at ktf.rtu.lv>:
>
>> Hi!
>>
>> Some times I receive HTML messages which are not displayed in IMP  
>> static (don't know about dynamic); IMP says that there is a text  
>> part but nothing is displayed.
>
> I can verify that this message views fine if HTML display is activated.
>
> The reason you are seeing nothing is because the plaintext  
> alternative version of the part is empty.

clear, but where can i activate it (under user's mail/preferences or  
somewhere else?)