On 2020-02-03 00:54, Viktor Dukhovni wrote:

> > > And is the OpenSSL library that "/usr/bin/openssl" is linked with, the
> > > same one as the one for Exim?
> > 
> > I am quite sure it is, because I build exim myself.  I cannot be 100%
> > sure for debian packaged exim, but such a blunder would be completely
> > out of character.
> 
> The idea is not to be "sure", but to actually check with "ldd".
> 
> > > Is the /etc/ssl/certs/ directory "hashed" (lots of funny
> > > <hexdigits>.<smalldecimal> symlinks)?
> > 
> > Yes.
> 
> Well, in that case perhaps Exim is not loading the default CA locations,
> or there's some sort of file access control (SELinux? AppArmor? ...)
> that's preventing Exim from reading the directory.
> 
> You'll have "strace" Exim and see what it is doing when it fails
> to verify the peer chain.
> 
> Did you share the destination domain name at any point?  Perhaps
> its certificate chain really does have some sort of issue.

... Waiting for the OP to respond ...

-- 
Ian

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