Please advise what I am doing wrong.
Info on system and postfix follows.
$dmesg | less
[ 0.000000] Linux version 3.4.112-bananian (root@bananian-build) (gcc version 4.9.2 (Debian 4.9.2-10) ) #6 SMP PREEMPT Fri May 13 18:21:01 UTC 2016
[ 0.000000] CPU: ARMv7 Processor [410fc074] revision 4 (ARMv7), cr=10c5387d
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[ 0.000000] Machine: sun7i
...
root@bananapi /home/user # apt list --installed | grep 'postfix'
WARNING: apt does not have a stable CLI interface yet. Use with caution in scripts.
postfix/stable,now 2.11.3-1 armhf [installed]
Regards