Jul  5 07:28:50 vpsg postfix/smtp[17887]: fatal: socket: Too many open files in system
Jul  5 07:29:51 vpsg postfix/tlsmgr[13607]: fatal: accept connection: Too many open files in system
Jul  5 07:29:52 vpsg postfix/smtp[18221]: fatal: open active 2F52ABC971A: Too many open files in system
Jul  5 07:31:34 vpsg postfix/local[20168]: fatal: open active 3DB11BC971B: Too many open files in system
Jul  5 07:31:35 vpsg master[20172]: fatal: master_spawn: exec /usr/lib/postfix/flush: Too many open files in system
Jul  5 09:09:18 vpsg postfix/bounce[24423]: fatal: open file defer 4BDBFBC971E: Too many open files in system
Jul  5 11:33:35 vpsg master[17468]: fatal: master_spawn: exec /usr/lib/postfix/local: Too many open files in system
Jul  6 11:53:45 vpsg postfix/sendmail[7473]: warning: fork: Too many open files in system
Jul  6 11:53:55 vpsg postfix/pickup[21759]: warning: open input file maildrop/22618BC971F: cannot open file: Too many open files in system
Jul  7 14:01:14 vpsg postfix/cleanup[8001]: warning: mail_queue_enter: create file incoming/996522.8001: Too many open files in system
Jul  7 18:40:00 vpsg postfix/pickup[15932]: fatal: scan_dir_push: open directory maildrop: Too many open files in system
Jul  7 21:06:36 vpsg postfix/master[28314]: fatal: socket: Too many open files in system
v

vpsg:~# cat /proc/user_beancounters
Version: 2.5
       uid  resource           held    maxheld    barrier      limit    failcnt
     33000: kmemsize        3574356    3793573    5457600    7621440          0
            lockedpages           0          0        128        128          0
            privvmpages       59299     129733     262144     262144         12
            shmpages            666       1002       1152       1152         24
            dummy                 0          0          0          0          0
            numproc              68         85       1024       1024          0
            physpages         21974      59970          0 2147483647          0
            vmguarpages           0          0     131072 2147483647          0
            oomguarpages      21975      59970     131073 2147483647          0
            numtcpsock           31         55        512        512          0
            numflock             12         17         50         60          0
            numpty                1          5        256        256          0
            numsiginfo            0         61        256        256          0
            tcpsndbuf        356480     530264    1048576    1048576          0
            tcprcvbuf             0     316376    1048576    1048576          0
            othersockbuf     188404     533976    1048576    1048576          0
            dgramrcvbuf           0      17824    1048576    1048576          0
            numothersock        123        140       1024       1024          0
            dcachesize       383432     405818    1048576    1048576          0
            numfile             941       1024       1024       1024        589
            dummy                 0          0          0          0          0
            dummy                 0          0          0          0          0
            dummy                 0          0          0          0          0
            numiptent            10         61       1024       1024          0
vpsg:~#