Comment # 11 on bug 729154 from Tom���� Chv��tal

Still happens on factory...

lis 23 19:15:21 bugaboo postfix/postdrop[24156]: warning: mail_queue_enter:
create file maildrop/489614.24156: Permission denied
lis 23 19:15:21 bugaboo postfix/postdrop[30711]: warning: mail_queue_enter:
create file maildrop/489614.30711: Permission denied
lis 23 19:15:31 bugaboo postfix/postdrop[24156]: warning: mail_queue_enter:
create file maildrop/489727.24156: Permission denied
lis 23 19:15:31 bugaboo postfix/postdrop[30711]: warning: mail_queue_enter:
create file maildrop/489727.30711: Permission denied
lis 23 19:15:41 bugaboo postfix/postdrop[24156]: warning: mail_queue_enter:
create file maildrop/489838.24156: Permission denied
lis 23 19:15:41 bugaboo postfix/postdrop[30711]: warning: mail_queue_enter:
create file maildrop/489838.30711: Permission denied
lis 23 19:15:51 bugaboo postfix/postdrop[24156]: warning: mail_queue_enter:
create file maildrop/489957.24156: Permission denied
lis 23 19:15:51 bugaboo postfix/postdrop[30711]: warning: mail_queue_enter:
create file maildrop/489957.30711: Permission denied

bugaboo:~ # postfix check
postfix/postfix-script: warning: not owned by group maildrop:
/usr/sbin/postqueue
postfix/postfix-script: warning: not owned by group maildrop:
/usr/sbin/postdrop
postfix/postfix-script: warning: not set-gid or not owner+group+world
executable: /usr/sbin/postqueue
postfix/postfix-script: warning: not set-gid or not owner+group+world
executable: /usr/sbin/postdrop

bugaboo:/var/spool/postfix # l
total 0
drwxr-xr-x 1 root    root     166 Oct 31 17:23 ./
drwxr-xr-x 1 root    root     128 Oct 31 17:17 ../
drwx------ 1 postfix root       0 Nov 14 01:00 active/
drwx------ 1 postfix root       0 Sep 29 06:07 bounce/
drwx------ 1 postfix root       0 Sep 29 06:07 corrupt/
drwx------ 1 postfix root       0 Sep 29 06:07 defer/
drwx------ 1 postfix root       0 Sep 29 06:07 deferred/
drwx------ 1 postfix root       0 Sep 29 06:07 flush/
drwx------ 1 postfix root       0 Sep 29 06:07 hold/
drwx------ 1 postfix root       0 Nov 14 01:00 incoming/
drwx-wx--- 1 postfix maildrop   0 Nov 14 01:00 maildrop/
drwxr-xr-x 1 root    root      64 Nov 18 11:16 pid/
drwx------ 1 postfix root     200 Nov 24 09:41 private/
drwx--x--- 1 postfix maildrop  54 Nov 24 09:41 public/
drwx------ 1 postfix root       0 Sep 29 06:07 saved/
drwx------ 1 postfix root       0 Sep 29 06:07 trace/

This is clean Factory install old 1 month so there can't be any migration in
effect from older releases.

Some forums:
[1]
http://www.karlesnine.com/2008/07/23/postfix-erreur-warning-mail_queue_enter-create-file-maildrop-permission-denied/
[2]
http://collinpark.blogspot.cz/2013/10/an-almost-painless-os-upgrade-opensuse.html