If you use the "lmtp" delivery agent for delivery to Dovecot:
/etc/postfix/master.cf:
lmtp .. .. .. .. .. ... lmtp
flags=DORX
/etc/postfix/main.cf:
# Here "lmtp" is the name of the first field in master.cf.
lmtp_destination_recipient_limit = 1
Just to provide feedback.
Dovecot LMTP (default settings) was already adding the D & R headers prior to
this.
Adding only _limit=1 to postfix did not change behavior or add any headers.
Adding _limit=1 and flags=DORX caused postfix to add the DOR headers creating
duplicate DR headers because dovecot still added them.
What ended up working in my situation was keeping the _limit=1 and flags=OX
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