* Harald Koch via Postfix-users <c...@pobox.com>:
> On Tue, Mar 7, 2023, at 12:02, Benny Pedersen via Postfix-users wrote:
> >
> > why is arc invalid ?
> 
> My email provider is adding a little more detail:
> 
> Authentication-Results: pb-mx20.pobox.com;
>     arc=invalid
>       (as.1.list.sys4.de=invalid (public key: does not support hash algorithm 
> 'sha256'), ams.1.list.sys4.de=invalid (public key: does not support hash 
> algorithm 'sha256'))
>       smtp.remote-ip=188.68.34.52;

Thank you. We'll investigate into this.

p@rick


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