Mappings file syntax

Question

iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)
What is the preferred method of configuring an MTA to not take outside connections at all but only those generated on the local host?
Do I comment out the " * $YEXTERNAL" line in my mappings file ?
Also, if I wanted to only take connections from a couple subnets what is the syntax, eg from 128.111.207/206 subnets.
Pasted below is the current mappings settings for the MTA in question:
! Modified by IMS administration server on: Sat Jun 05 22:43:51 PDT 2004
PORT_ACCESS
*|*|*|*|* $C$|INTERNAL_IP;$3|$Y$E
* $YEXTERNAL
INTERNAL_IP
$(128.111.207.251/32) $Y
127.0.0.1 $Y
* $N

Answer 1

Hi,
What is the preferred method of configuring an MTA to
not take outside connections at all but only those
generated on the local host?
Do I comment out the " * $YEXTERNAL" line in my
mappings file ?I don't know about a preferred method but one method would be to replace " * $YEXTERNAL" with " * $N". Any host/IP address that doesn't match your INTERNAL_IP mapping table will be rejected.
Also, if I wanted to only take connections from a
couple subnets what is the syntax, eg from
128.111.207/206 subnets.If you wanted to treat these subnets as 'internal' (so they can relay through your system) you would add the following to your INTERNAL_IP mapping file (just above the $N line):
  $(128.111.206.0/24)  $Y
  $(128.111.207.0/24)  $YOtherwise you would add the same lines to your PORT_ACCESS mapping table just above the $N (and then the emails from these hosts would be treated as 'external', namely on tcp_local.
You need to run ./imsimta cnbuild; ./imsimta refresh after making the changes.
Regards,
Shane.