Postfix block with smtpd_recipient_restrictions

OS type and version Ubuntu Linux 22.04.3
Webmin version 2.105
Usermin version 2.005
Virtualmin version 7.8.2
Theme version 21.09.5
Package updates All installed packages are up to date

using /etc/postfix/
smtpd_recipient_restrictions = check_sender_access hash:/etc/postfix/sender_access,permit_mynetworks,permit_sasl_authenticated,reject_unauth_destination

however, whilst the sender_access exists, and is postmapped ok (with postmap /etc/postfix/sender_access)
…, it is being ignored, i.e nothing blocked !
is this a problem with the other settings here in smtpd_recipient_restrictions ?

thanks, appreciate your time.

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