Matthias Apitz wrote: 
> 
> Hello,
> 
> Since some days I get 
> 
> Certificate host check failed: certificate owner does not match hostname 
> pod51010.outlook.com
> 
> This certificate belongs to:
>    outlook.com
>    Unknown
>    Microsoft Corporation
>    Unknown
>    Redmond
>    Washington
>    US
> 
> This certificate was issued by:
>    DigiCert Cloud Services CA-1
>    Unknown
>    DigiCert Inc
>    Unknown
>    Unknown
>    Unknown
>    US
> 
> This certificate is valid
>    from Oct  7 00:00:00 2020 GMT
>      to Oct  7 12:00:00 2021 GMT
> -- Mutt: SSL Certificate check (certificate 3 of 3 in chain)
> (r)eject, accept (o)nce
> 
> when I connect with mutt to imaps://pod51010.outlook.com/

Are you supposed to be connecting to pod51010, or to a branded
name or something like outlook.office365.com ?

Try 

openssl s_client -connect pod51010.outlook.com:993

to see what cert it is actually handing out.

-dsr-


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