[root@klaus ~]# ls -all /var/lib/imap/socket/
total 64
drwxr-x---  2 cyrus mail 4096 Sep 26 15:38 .
drwxr-x--- 16 cyrus mail 4096 Sep 26 15:38 ..
srwxrwxrwx  1 cyrus mail    0 Sep 26 15:38 idle
-rw-------  1 cyrus mail    0 Sep 20 11:05 imap-0.lock
-rw-------  1 cyrus mail    0 Sep 20 11:05 imap-1.lock
-rw-------  1 cyrus mail    0 Sep 20 11:05 imaps-0.lock
-rw-------  1 cyrus mail    0 Sep 20 11:05 imaps-1.lock
srwxrwxrwx  1 root  root    0 Sep 26 15:38 lmtp
-rw-------  1 cyrus mail    0 Sep 20 12:10 lmtp-1.lock
-rw-------  1 cyrus mail    0 Sep 20 11:05 lmtpunix-0.lock
-rw-------  1 cyrus mail    0 Sep 20 11:05 pop3-0.lock
-rw-------  1 cyrus mail    0 Sep 20 11:05 pop3-1.lock
-rw-------  1 cyrus mail    0 Sep 20 11:05 pop3s-0.lock
-rw-------  1 cyrus mail    0 Sep 20 11:05 pop3s-1.lock