mkdir /mnt/pframqueue
mount -t tmpfs -o size=512M tmpfs /mnt/pframqueue
service postfix stop
mv /var/spool/postfix/* /mnt/pframqueue/
<<<adjust 'queue_directory' in main.cf to /mnt/pframqueue>>>
service postfix start

sudo postconf -e defer_transports=smtp; sudo postfix reload
sudo postconf -e defer_transports=; sudo postfix reload; sudo postfix flush