Why does Gnus remove To: from forwarded messages?

[Adam Sjøgren]

I just noticed that when I forward a message, the To: header gets
removed.

It this something I have configured wrong, or is there a(nother) reason?

Example:

  Email looks like this:

    From: "Svenska Domäner" <registry@example.com>
    Subject: 30 Dagars förnyelsepåminnelse 2019-01-24
    To: asjo@koldfront.dk
    Date: Wed, 26 Dec 2018 10:49:05 +0000 (11 hours, 20 minutes, 19 seconds ago)

  When I forward it, I get this in the body of the new email:

    -------------------- Start of forwarded message --------------------
    Date: Wed, 26 Dec 2018 10:49:05 +0000
    Subject: 30 Dagars förnyelsepåminnelse 2019-01-24
    From: "Svenska Domäner" <registry@example.com>


  Best regards,

    Adam

-- 
 "Stockholm vaknar långsamt                                   Adam Sjøgren
  På droger och på sorg"                                 asjo@koldfront.dk