Why is our server is listed as an Open Relay

Following is my mappings file:

<pre>

! VERSION=1.0

! Modified by IMS administration server on: Fri Mar 01 16:55:38 EST 2002

!

PORT_ACCESS

*|*|*|*|* $C$|INTERNAL_IP;$3|$Y$E

* $YEXTERNAL

INTERNAL_IP

$(XXX.XXX.XXX.0/32) $Y

127.0.0.1 $Y

* $N

LIST_AUTH

*;*|* $[IMTA_LIBUTIL,imdlauth,$2+$1@$0]

ORIG_SEND_ACCESS

tcp_local|*|tcp_local|* $Y

tcp_local|*|tcp_internet|* $Y

tcp_local|*|tcp_local|* $N$D30|Relaying$ not$ allowed

tcp_*|*|hold|* $N

tcp_*|*|pipe|* $N

tcp_*|*|ims-ms|* $N

SEND_ACCESS

tcp_*|*|*|*@[127.*] $X5.1.2|$NBad$ destination$ system

tcp_*|*|*|*@localhost.* $X5.1.2|$NBad$ destination$ system

*|*|inactive|* $X4.2.1|$NMailbox$ temporarily$ disabled

*|*|deleted|* $X5.1.6|$NRecipient$ no$ longer$ on$ server

</pre>

The XXX.XXX.XXX.0 is our Class C Block of IP's.

I have just installed this server so I don't fully understand it yet.

Thanks in advance for any help with this.

[1125 byte] By [708760] at [2007-11-25 7:10:37]