MX V5.1 ECO 15, 06-JAN-2000

*** THIS KIT SUPERSEDES ECOs 01, 05, 10, 12

Change description:

   * Fix for host name lookups on systems that
     do not use the Domain Name System, to eliminate
     NODNSRESPONSE errors.

Previous changes (ECO 12):

   * Fix lockfile checks to ensure that on the final
     attempt to deliver a message to a recipient, lock
     processing is skipped and the actual delivery
     status is provided in the DSN failure report.

Previous changes (ECO 10):

   * Fix channel leak in SMTP agent by ensuring that
     the MSG_TEXT file is closed under all error
     conditions.

   * Fix the alarm that is generated when the agent
     cannot open an SMTP_INFO file for an entry, so the
     entry number is correctly displayed in the message.

Previous changes (ECO 05):

   * Add support for a new logical name to disable the
     use of the SMTP PIPELINING extension:

     $ DEFINE/SYSTEM/EXEC MX_SMTP_IGNORE_PIPELINING TRUE

     The value of the logical name is unimportant; the
     extension will be ignored if the logical name exists.

Previous changes (ECO 01):

   * Add support for a new logical name to limit the
     number of recipients listed in a single SMTP session,
     to deal with poorly configured mailers that return
     permanent errors when their recipient limit is reached.

     The new logical name is

     $ DEFINE/SYSTEM/EXEC MX_SMTP_MAX_RECIPIENTS_PER_SESSION n

     where "n" is a decimal number.  If "n" is zero, or the
     logical name does not exist, there is no limit.

Installation:

    1. Copy the appropriate image (VAX or Alpha) to MX_EXE:

          $ COPY MX_SMTP.{AXP|VAX}_EXE MX_EXE:*.EXE

    2. Shutdown and restart the SMTP server:

    	  $ MCR MX_EXE:MCP SHUTDOWN SMTP
          $ @SYS$STARTUP:MX_STARTUP SMTP

* If you have a mixed VMScluster with both VAX and Alpha systems,
  you will need both images - one for each architecture.

* If you run the SMTP agent on multiple nodes in your
  cluster, you should execute step 2 on each of the nodes currently
  running the SMTP agent.