On 2021-03-06, Deloptes  wrote:
> Jim Jackson wrote:
>
>> Not got a running "Buster" raspberry PiOS, but a Debian based system
>> search gives
>>
>> ca-certificates - Common CA certificates
>
> I don't see anything like pki in this package
>
> In Debian it is under /etc/ssl/certs/ca-certificates.crt

This file is created by the update-ca-certificates script which is called
by the post install script of the ca-certificates package.  That script
generates the bundle file from the certificates stored in both
/usr/share/ca-certificates and /usr/local/share/ca-certificates.  Installing
the ca-certificates package should cause the file Postfix is looking for
to be generated.

--Matt

--
Matthew Ernisse 

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