>>> "AS" == Adam Sjøgren <asjo@koldfront.dk> writes:

> Uwe writes:
>> I use gnus and gmail smtp mail server run your experiment and received 
>> 
>> From: Uwe Brauer <blabla@gmail.com>
>> Subject: test undisclosed
>> Date: Mon, 11 Feb 2019 20:01:07 +0100 (2 minutes, 3 seconds ago)
>> Reply-To: Uwe Brauer <blabla@gmail.com>
>> 
>> So no undisclosed-recipients:; is inserted.

> I guess it is the Gmail web-interface that inserts it then.

>> Sort of odd?

> Why?

> You didn't answer this question:

>>> Why do you find it attractive to have this value in To:‽

Sorry you mean to undisclosed recipients? well because it reveals some
information. People sometimes wounder if they receive an email and the
To field is empty