[horde] Prepend forwarded messages with the ">" sign

[Mike Maikaefer]

Hi,

no matter which option I use to forward a message, I never see the
forwarded text prepended with a ">" sign. Means when the forwarded text is
contained in the body text, I get a delimiter in style

----- Forwarded message from xxx at yyy.zzz -----
   Date: Thu, 12 Apr 2018 10:37:36 +0100 (BST)
   From: xxx at yyy.zzz
Subject: aaaaaaa
     To: bbb at ccc.ddd

...but the following text comes without this special
quotation/reply/forward mark.

So my question: what do I have to do/configure to get these ">" signs in
front of every line of a forwarded text?

Thanks!