Cannot allocate memory: while opening or reading /home/USER/mail/domain.com/webmas

[sh4ka]

Im using Exim, and RedHat 4 with latest release version of cPanel,

While recieving mail I got this error:

2007-05-03 11:48:06 1HjeTO-0001Nh-Hm == webmaster@domain.com R=virtual_user T=virtual_userdelivery defer (12): Cannot allocate memory: while opening or reading /home/USER/mail/domain.com/webmaster/maildirsize

Checked if I dont have any free memory, but memory is really good:

[root@server.1.com:~]free
             total       used       free     shared    buffers     cached
Mem:       2073516     537280    1536236          0      22012     193528
-/+ buffers/cache:     321740    1751776
Swap:      2048276          0    2048276
[root@server.1.com:~]

Also, load average is fine:

[root@server.1.com:~]w
 11:55:46 up 11 min,  1 user,  load average: 0.36, 0.28, 0.18
USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT
root     pts/0    200.40.191.170   11:47    1.00s  0.17s  0.07s w

Does anyone know about this issue and how to fix it ?

Thank you in advance.