[Tickets #14560] custom header in Mail view cannot be configured

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Ticket URL: https://bugs.horde.org/ticket/14560
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  Ticket             | 14560
  Created By         | target at servus.at
  Summary            | custom header in Mail view cannot be configured
  Queue              | Horde Groupware Webmail Edition
  Version            | 5.2.12
  Type               | Bug
  State              | Unconfirmed
  Priority           | 1. Low
  Milestone          |
  Patch              |
  Owners             |
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target at servus.at (2017-01-12 17:32) wrote:

The Setting:

Preferences for Mail -> Viewing ->  Additional headers to display when  
viewing: (enter each header on a new line)

Has no effect at all. It is saved correctly. I did not find help on  
the syntax required here.
So I tried wit the terms: "Message-ID" or "Reply-To", And also with a  
":" after the term.

The header in the mail-view does not change.
Side-Note: Adding more info to the header is desired, because the  
header-display hides the email address in "From:" and "To:" behind a  
button labeled with the "Name"-part of the corresponding header element.
Can this be configured?