X400: Slow Message Transfer

ID: Q111946

The information in this article applies to:

Microsoft Mail Gateway to X.400, versions 3.0, 3.2

SYMPTOMS

Microsoft Mail Gateway to X.400 may process messages slowly.

CAUSE

Slow message transfer may result from a large (4000 or more names) custom address map. The X.400 gateway reads the custom address map file (MAPTBL.OUT) in 1K blocks. If a large custom address map exists, it takes time to read the entire file. Other X.400 gateway read activity is handled in 4K blocks.

RESOLUTION

A supported fix that corrects this problem is now available from Microsoft, but has not been fully regression tested and should be applied only to systems experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://support.microsoft.com/support/supportnet/default.asp

The English version of this fix should have the following file attributes or later:


   File Name      Version
   ----------------------
   X400gate.exe   3.2.13

This hotfix has been posted to the following Internet location as X400gy2k.exe:

ftp://ftp.microsoft.com/bussys/mail/pcmail-public/all-y2k/

STATUS

Microsoft has confirmed this to be a problem in Microsoft Mail Gateway to X.400 versions 3.0 and 3.2.

MORE INFORMATION

Microsoft has made two changes to the X.400 gateway to increase the search speed when you use a custom mapping table:

The algorithm used to search the custom mapping table has been changed to search first on the X.400 O/R attribute most likely to be unique (the surname attribute).

A parameter is now available in the X400GATE.INI file that allows you to move the mapping table to the local gateway computer. The table can then be loaded into a RAMDrive for quick access. You should add the new parameter to the [Microsoft X.400 gateway] section, following the example below:
```
      [Microsoft X.400 gateway]
      LocalCustomMappingFile=c:\maptbl.out 
```

For more information about the custom mapping table, please see the X.400 Gateway "Administrator's Guide." For more information about the RAMDrive program, please see your Microsoft MS-DOS documentation.

Additional query words: x400 address table 3.00 3.20 receiving

Keywords : MailGWX400
Version : MS-DOS:3.0,3.2
Platform : MS-DOS
Issue type : kbbug