I have all the checkboxes checked in the configure kmail > composer > general and signature section. But when replying or replying all, Kmail doesn't add my signature to the message automatically. The work arround is to add %SIGNATURE in the standard reply template. Kmail should add signature when replying/replying all, when the option for adding signature automatically is checked, without the need to edit standard template. I am using kmail 5.8.2 on arch linux plasma version is 5.13.1 kde framework version is 5.47.0 Qt version is 5.11.1
This is not reproducible now, so I am closing this.