On Fri, Jul 08, 2022 at 07:22:51PM +0200, Wim wrote:
> The strange thing is that the client machine and server are the same...

The client's not necessarily the same.  Linux might be using OpenSSL,
OpenBSD is almost certainly using LibreSSL, there might be differences
on the root certificates accepted by each OS, etc.

Compare the output of

    openssl s_client -showcerts -servername mail.thinkerwim.org -connect 
mail.thinkerwim.org:587 -starttls smtp

and check for differences. 

> Maybe Mut looks into the wrong place. I installed mutt from the openbsd 
> package and using openbsd 7.1
> 
> Thanks for the help.
> Kind regards
> Wim
> 
> Philipp Buehler <[email protected]> schreef op 8 
> juli 2022 16:31:31 CEST:
> >Am 08.07.2022 15:49 schrieb Dave Voutila:
> >
> >> $ openssl s_client -showcerts -servername mail.thinkerwim.org -connect
> >> mail.thinkerwim.org:587
> >
> >`-starttls smtp` helps a lot. The cert is there (also on :25 ftm) and signed 
> >by LE.
> >
> >The rub is that the mutt client machine does not know that issuer,
> >See openssl documentation how to do this.
> >
> >HTH
> >-- 
> >pb
> >

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