This leads to another effect: the dovecot deliver command may complain like this "Fatal: postmaster_address setting not given". The problem is, that dovecot's deliver command defined in master.cf needs the -c parameter too:
dovecot unix - n n - - pipe
flags=DRhu user=vmail:vmail argv=/usr/lib/dovecot/deliver -c /etc/dovecot/dovecot-postfix.conf -f ${sender} -d ${recipient}
This leads to another effect: the dovecot deliver command may complain like this "Fatal: postmaster_address setting not given". The problem is, that dovecot's deliver command defined in master.cf needs the -c parameter too:
dovecot unix - n n - - pipe lib/dovecot/ deliver -c /etc/dovecot/ dovecot- postfix. conf -f ${sender} -d ${recipient}
flags=DRhu user=vmail:vmail argv=/usr/