We just upgraded to ZCS 5.0.4.

While we expected our Postfix main.cf tweaks under 4.5.11 to have disappeared during the upgrade, it seems the previous method of using "postconf -e <variable>=<value>" followed a "postfix restart" doesn't survive a server restart.

We see there are a lot of new Postfix variables set in localconfig.xml.

Is editing localconfig.xml now the correct way to make permanent tweaks to Postfix?

We'd like to set the following:

<key name="postfix_smtpd_hard_error_limit">
<key name="postfix_smtpd_soft_error_limit">
<key name="postfix_smtpd_error_sleep_time">
<key name="postfix_proxy_interfaces">
<value>[Server Public IP Address]</value>

(The first three together we find to be an effective anti-UCE technique.)

We are not finding anything in the Administrators Manual or the Support Portal about this.