Edit the postfix master.cf:

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vim /etc/postfix/master.cf
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Uncomment the following lines:

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smtps inet n – – – – smtpd
-o syslog_name=postfix/smtps
-o smtpd_tls_wrappermode=yes
-o smtpd_sasl_auth_enable=yes
-o smtpd_client_restrictions=permit_sasl_authenticated,reject
# -o milter_macro_daemon_name=ORIGINATING
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*leave milter commented.

Now restart postfix for changes to take effect:

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/etc/init.d/postfix restart
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Written by Matt Cooper
Hi, I'm Matt Cooper. I started this blog to pretty much act as a brain dump area for things I learn from day to day. You can contact me at: matt@matthewc424.sg-host.com.