Bailo, John:
> I set up postfix with the dkim-milter.
>
> It works great when I am logged into the linux server and send
> mail with the mail command.
>
> However, if I try to connect to postfix from a remote computer,
> and send mail using a client such as outlook, the DKIM-Signature
> is not being added.

Wietse:
> You probably should use the submission mail service, like this:
> 
> /etc/postfix/master.cf:
>     submission      inet    n       -       -       -       -
> smtpd
>       -o smtpd_tls_security_level=encrypt
>       -o smtpd_sasl_auth_enable=yes
>       -o smtpd_client_restrictions=permit_sasl_authenticated,reject
>       -o milter_macro_daemon_name=ORIGINATING
> 
> And configure dkim-filter to run as
> 
>     /some/where/dkim-filter -m ORIGINATING ...

Bailo, John:
> Do you think this is a better solution than trying to set the "Internal
> Hosts" parameter?

The above works for outlook clients on dynamic and static IP addresses.

You wrote: 

    connect to postfix from a *remote* computer, and send mail
    using a client such as outlook

You did not write that the remote outlook client has a static IP address.

        Wietse

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