Configur username/password postfix+cyrus

I am installing mailman3-full on ubuntu 18.10

Following http://docs.mailman3.org/en/latest/config-web.html I need to find out how to set the user name and password for django to connect to Postfix.

Postfix seems to be using cyrus.

$ postconf |grep smtpd_sasl_type
smtpd_sasl_type = cyrus

Hopefully following down the correct rabbit hole at http://www.postfix.org/SASL_README.html#server_cyrus it is directing me to /etc/sasl2/smtpd.conf

That file does not exist.

In the Postfix configuration I have:

$ postconf |grep smtpd_sasl_security_options
smtpd_sasl_security_options = noanonymous
smtpd_sasl_tls_security_options = $smtpd_sasl_security_options

I cannot find out what that means.

I am lost at this point.

FWIIW I have a empty sasl directory under /etc/postfix

$ find /etc/postfix/sasl/
/etc/postfix/sasl/