Backport for Jessie

debian/changelog

-chef-handler-mail (0.1.2+20141105.fb56e0ae-1~bpo9+1) stretch-backports; urgency=medium
+chef-handler-mail (0.1.2+20141105.fb56e0ae-1~bpo8+1) stretch-backports; urgency=medium
 
-  * Rebuild for stretch-backports.
-  * Backport for stretch
+  * Backport for Jessie
 
  -- Christopher Huhn <C.Huhn@gsi.de>  Wed, 18 Apr 2018 17:41:57 +0200
 

debian/gbp.conf

 [DEFAULT]
-debian-branch = stretch-backports
+debian-branch = jessie-backports