MAILbus 400 Message Transfer Agent and Application Program
                 Interface, Version X3.0-6 for OpenVMS VAX


This Cover Letter lists the functional changes that have been introduced
in Version X3.0-6 of MAILbus 400 MTA.


Functional Changes
------------------

MTA Version X3.0-6 is based on MTA V3.0 and it includes the fix for the
following IPMTs, ASN.1 Vulnerabilities and also a system wide logical to
enable/disable STA.

1. IPMT CFS.95953
   Fix for Missing Bodyparts problem with the CDIF converter.

2. IPMT CFS.96374
   Modification has been done to read the value of the timer 
   (ma_finish_delivery temporary failure) from a system wide logical, 
   instead of taking the value from the compile time 'IR_K_RETRY_INT' 
   parameter.

   The Retry Interval for Agent has been implemented by means of a 
   System-wide logical, namely 'MTA$AGT_RETRY'. If this logical is not 
   set, then the timer value would be taken from the default compile 
   time parameter of TEN minutes.

   The logical 'MTA$AGT_RETRY' has to be defined system-wide before the 
   MTA startup. 
   Command to be used for the same:
      $ DEFINE/SYS MTA$AGT_RETRY "<time-factor-in-minutes>"

   For Ex.
      $ DEFINE/SYS MTA$AGT_RETRY "20"
      would assign 20 minutes to the Retry Interval timer.

3. IPMT CFS.96741
   Fix for Routing Instructions act on Agents/Gateways as CASE 
   INSENSITIVE

4. IPMT CFS.101523
   Incoming mail from Internet containing Message Bodypart without data 
   was crashing the MTA when CDIF conversion was enabled for the 
   recipient.

5. Fix for SSRT3624  X.400 potential security vulnerability via ASN.1
   cross reference: NISCC (006489) 
   A potential denial of service has been identified that may allow a 
   remote initiated Buffer Overflow when malformed ASN.1 messages are 
   submitted. This potential buffer overflow has been fixed in this 
   version.

Installation Prerequisites and Procedure:
-----------------------------------------

Versions of OpenVMS VAX that this patch should be installed on:

This patch should be installed on all the OpenVMS VAX machines that are 
running MAILbus 400 MTA V3.0 and X3.0-x versions.

 To install this kit follow the instructions in MAILbus 400 MTA In-
 stalling on an OpenVMS VAX System or MAILbus 400 API Installing
 on an OpenVMS VAX System with the following exceptions:

 o  Make sure you install one of the following configurations of
    prerequisite software:

    -  OpenVMS VAX V7.2 
       DECnet-Plus for OpenVMS VAX V7.2, including the DECnet 
       Application Interface component.
       Compaq X.500 Directory Service for OpenVMS V3.1 or V4.0-25
       or OpenVMS Enterprise Directory V5.0 or later.

    -  OpenVMS VAX V7.3
       DECnet-Plus for OpenVMS VAX V7.3, including the DECnet Applica-
       tion Interface component.
       Compaq X.500 Directory Service for OpenVMS V3.1 or V4.0-25
       or OpenVMS Enterprise Directory V5.0 or later.

Following is a brief description about the Installation procedure:
(For detailed installation procedure, refer the steps described in the 
Manual "MAILbus400 Message Transfer Agent Installing on an OpenVMS VAX 
System" Version 2.0.)

 1. Copy the MTA savesets to a directory. For example, 
    device-name:[MTA030]

 2. The command to install either the MTA or the API is:

       $ @SYS$UPDATE:VMSINSTAL MTA030 device-name:[MTA030]

 The image identification of the images in this kit is "MTA X3.0-6"

 The version number of the kit when displayed using NCL management is
 X3.0.6


Problem reporting:
------------------
Problems relating specifically to this kit should be reported through 
your normal HP support channel.