Lab 9.4 - Enable Relaying Using SMTP Authentication in Postfix

I think there is a typo in step 3 which reads:

# postconf -e "smtpd_recipient_restrictions" = \
permit_mynetworks,  \
permit_sasl_authenticated,       \
reject_unauth_destination",      \
reject

I believe it should instead read:

# postconf -e "smtpd_recipient_restrictions = \
permit_mynetworks,    \
permit_sasl_authenticated,       \
reject_unauth_destination,      \
reject"

Is the end goal not to have the following line(s) in main.cf?

smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject

Also a note on versioning from the manual. I got the lab working (rejecting unathentuicated) using smtpd_relay_restrictions instead of smtpd_recipient_restrictions

       With  Postfix  versions  before 2.10, the rules for relay permission and spam blocking were combined
       under smtpd_recipient_restrictions, resulting in error-prone configuration.   As  of  Postfix  2.10,
       relay  permission  rules are preferably implemented with smtpd_relay_restrictions, so that a permis‐
       sive spam blocking policy under smtpd_recipient_restrictions will no longer result in  a  permissive
       mail relay policy.

       For  backwards  compatibility,  sites  that  migrate  from  Postfix  versions  before  2.10  can set
       smtpd_relay_restrictions to the empty value, and use smtpd_recipient_restrictions exactly as before.