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Description of problem:
A customer reported, that when starting postfix on RHEL 8, the following warning is displayed:

restorecon[164623]: /usr/sbin/restorecon: lstat(/var/spool/postfix/pid/master.pid) failed: No such file or directory

It seems that this is a side-effect of https://bugzilla.redhat.com/show_bug.cgi?id=2028015

Version-Release number of selected component (if applicable):
postfix 3.5.8-4.el8

How reproducible:
always

Steps to Reproduce:
1. install postfix
2. start postfix
3. check journalctl for warning: journalctl | grep master.pid

Actual results:
A warning is shown for master.pid missing

Expected results:
No warning should be shown, as everything is working as expected and the master.pid should not be there at this stage during start.

This is fixed by dropping the filename from the following line in postfix.service:

ExecStartPre=-/usr/sbin/restorecon -R /var/spool/postfix/pid

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (postfix bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:7123