can't encrypt with public key from sectigo (former comodo)

[Uwe Brauer]

Sent from my iPhone

> On 6. Feb 2019, at 18:03, Ingo Klöcker <kloecker at kde.org> wrote:
> 
> Add the CA certifcate of Sectigo to ~/.gnupg/trustlist.txt

My problem was I did not know where to find that CA certificate! 
Pointers are welcome. 
Finally I solved it as I described in a different message. 
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