This can't be right....
Using 'postconf -d smtpd_relay_restrictions'...
...on postfix v3.5 (Debian/Buster)
smtpd_relay_restrictions = ${{$compatibility_level} < {1} ? {} :
{permit_mynetworks, permit_sasl_authenticated,
defer_unauth_destination}}
...on postfix v3.6.3 (Debian/Bookworm)
smtpd_relay_restrictions = ${{$compatibility_level} <level {1} ? {} :
{permit_mynetworks, permit_sasl_authenticated,
defer_unauth_destination}}
Notice the extra word 'level' just to the right of the less-than symbol.
-Jim P.
