On Saturday 16 June 2018 22:57:07 Stefan Krusche wrote:
> Am Samstag 16 Juni 2018 schrieb Glen Cunningham:
> > Thanks for the reply, Stefan,
> >    None of the files that you suggest exit in this old
> > installation. G.
>
> Hi Glen,
>
> sorry, of course you need to look for these files in your old .kde3
> directory as deloptes pointed out as well. That's:
>
> .kde3/share/config/kmailrc
>
> becomes:
>
> .trinity/share/config/kmailrc
>
> Regards,
> Stefan
>
  Thanks, Stefan,
    That looks promising.
On this old computer , I have
glen@acmena2:~/.kde3/share/config$ ls -l  kmail*
-rw------- 1 glen glen    163 2016-02-14 10:32 kmail.eventsrc
-rw------- 1 glen glen 123083 2018-06-16 23:07 kmailrc
-rw------- 1 glen glen    201 2018-06-16 22:38 kmailsnippetrc
glen@acmena2:~/.kde3/share/config$ ls -l  email*
-rw------- 1 glen glen  156 2018-06-16 22:38 emaildefaults
-rw------- 1 glen glen 2357 2018-02-19 15:15 emailidentities
glen@acmena2:~/.kde3/share/config$ 

It is too late tonight, but first thing tomorrow, I will try to copy 
those 5 files to the new computer.
Ta,
G