This bug was fixed in the package postfix - 3.1.4-4ubuntu1
--------------- postfix (3.1.4-4ubuntu1) zesty; urgency=medium
* Use correct service dependencies in postfix@.service, to avoid racing systemd-resolved at boot. LP: #1519331.
-- Steve Langasek <email address hidden> Sat, 03 Jun 2017 00:35:57 -0700
This bug was fixed in the package postfix - 3.1.4-4ubuntu1
---------------
postfix (3.1.4-4ubuntu1) zesty; urgency=medium
* Use correct service dependencies in postfix@.service, to avoid racing resolved at boot. LP: #1519331.
systemd-
-- Steve Langasek <email address hidden> Sat, 03 Jun 2017 00:35:57 -0700