postscreen_access_list requires 'permit', not 'PERMIT'

[francis picabia]

I now notice there is a warning in the log file only when the postscreen_access
file is read (and should have matched):

Oct  2 15:41:05 mx10 postfix/postscreen[11731]: warning:
cidr:/etc/postfix/postscreen_access: unknown command: OK -- ignoring
the remainder of this access list

Also same warning with PERMIT

I'm simply listing an IP, some tabs, and PERMIT or OK
in attempt to whitelist dnsbl false positives.

e.g.:

210.44.128.104                  OK

So, with some experimenting, and checking again the documentation,
I switched it to use "permit" in lowercase.

210.44.128.104                  permit

Now it works.  I have many files configured with PERMIT in other
cases, and they all work.  This is the first time I've seen case
matter in a postfix config value.

Using 2.9.4 today...