Am 09.10.2009 um 10:11 schrieb Andreas Harder:

>> When I think about the default setup this would make more sense:
>>
>> \setupletterstyle[backaddress=no]
>> \setupletterstyle[backaddress][alternative=auto]
>>
>> WHat do you think?
>
> I think it would be more intuitive that way.

I will change this then in the next release, you could then enable the  
backaddress with \setupletterstyle[backaddres=yes]

>>> One more question: it would be nice if the rule under the back- 
>>> address would have the same length an the back-addres. Is there a  
>>> convenient way? I tried something with \textbackgrounds (example  
>>> below) but without success.
>>
>> \setupletterstyle
>>  [backaddress]
>>  [frame]
>>  [width=fit]
>
> Thank you! I tried to set width=fit, but without the frame-option …  
> Now one have to care of the width (I think there is no maxwidth- 
> option for frame setups?),

autowidth=force

> so I tried to set the backgroundaddress-style to style={\ifdim 
> \framedwidth<85mm \tfx \else \tfxx \fi}. But the problem is, that  
> \framedwidth measures with the default font size … Or do you know a  
> solution? ;)

Let me think about this (no time at the moment).

Wolfgang