On Mon, 27 Jul 2015 19:40:39 -0700, SSL <tuy...@aoiyuma.mydns.jp> wrote:
i am afraid of being attacked .
so i want to limit PCs in japan only (if japanese PC is hacked , this setting in not safe ) .

It would probably be more appropriate and effective to use a firewall such as OpenBSD's pf to accomplish this goal. OpenBSD also provides spamd which, along with a few selected real time black lists added to the mix, makes a very effective spam filter.

but i want to use conection secrity SSL/TLS .
how to do it ?

The smptd.conf(5) man page documents key generation in the EXAMPLES section near the end.

In this second example, the aim is to permit mail relaying for any user
     that can authenticate using their normal login credentials.  An RSA
     certificate must be provided to prove the server's identity.  The mail
     server listens on all interfaces the default route(s) point to.  Mail
with a local destination should be sent to an external mda. First, the
     RSA certificate is created:

           # openssl genrsa -out /etc/ssl/private/mail.example.com.key 4096
# openssl req -new -x509 -key /etc/ssl/private/mail.example.com.key \
                   -out /etc/ssl/mail.example.com.crt -days 365
           # chmod 600 /etc/ssl/mail.example.com.crt
           # chmod 600 /etc/ssl/private/mail.example.com.key

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