MAILERS+4:Build History

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Build 3837

April 2021 Update

Released April 2021

General Changes

  • The Presort Object Build number updated to 22378
  • A new file has been added to the Mailers+4 updates: LocaleKey.csv
This file is for Seamless Acceptance mailers and can be found in the following directory: mp4_202103/Data/LocaleKey.csv


Build and Database Information

COM Object Build #
PresortObject 22378
AddressObject 17207
mdGeo 17187
PhoneObject 3145
NameObject 151


Presort Date
Zone Table 04/01/2021
Delivery Statistics 02/20/2021
Module L Label Lists 04/01/2021
ELOT Table 03/15/2021


Database Date
National Database 03/15/2021
FirstName Database 02/15/2000


Release Notes

To confirm the most up-to-date builds are installed, please check the following within Mailers+4:
  • Click "Help" – "About Mailers+4" to confirm Mailers+4 build is 3837.
  • Click "Help" – "Mailers+4 Information" to confirm Presort Object build change to 22378.
New LocaleKey.csv Information
File Information Description
File Name LocaleKey.csv
File Type Comma Delimited (.csv)
File Contents The LocaleKey.csv will contain a list of every Post Office and its associated Locale Key.
Update Frequency The LocaleKey.csv will be updated Monthly along with the other Presort data files.
The LocaleKey.csv will include the following fields:
Field Name Description Sample Data
LocaleKey Unique Identifier for the post office. LOCZ22621
DestinationCode The Type of Post Office. D = DDU

S = SCF
B = NDC

Name The Name of the Post Office. RANCHO SANTA MARGARITA
Address The Address of the Post Office. 29862 AVENIDA DE LAS BANDERA
City The City of the Post Office. RANCHO SANTA MARGARITA
State The State of the Post Office. CA
Zip The zip of the Post Office. 926889998
A Mailers+4 Web Tutorial link has been added to the wiki under Essentials - Tutorials for easy reference.


March 2021 Update

Released March 2021

General Changes

  • The Presort Object Build number updated to 22376


Build and Database Information

COM Object Build #
PresortObject 22376
AddressObject 17207
mdGeo 17187
PhoneObject 3145
NameObject 151


Presort Date
Zone Table 03/01/2021
Delivery Statistics 02/01/2021
Module L Label Lists 03/01/2021
ELOT Table 02/15/2021


Database Date
National Database 02/15/2021
FirstName Database 02/15/2000


Release Notes

To confirm the most up-to-date builds are installed, please check the following within Mailers+4:
  • Click "Help" – "About Mailers+4" to confirm Mailers+4 build is 3837.
  • Click "Help" – "Mailers+4 Information" to confirm Presort Object build change to 22376.


February 2021 Update

Released February 2021

General Changes

  • Fixed the issue where the Record Count did not match between the .PBC and the .HDR Maildat files.
  • The Presort Object Build number updated to 22374


Build and Database Information

COM Object Build #
PresortObject 22374
AddressObject 17207
mdGeo 17187
PhoneObject 3145
NameObject 151


Presort Date
Zone Table 02/01/2021
Delivery Statistics 12/27/2020
Module L Label Lists 02/01/2021
ELOT Table 01/15/2021


Database Date
National Database 01/15/2021
FirstName Database 02/15/2000


Release Notes

To confirm the most up-to-date builds are installed, please check the following within Mailers+4:
  • Click "Help" – "About Mailers+4" to confirm Mailers+4 build change to 3837.
  • Click "Help" – "Mailers+4 Information" to confirm Presort Object build change to 22374.


January 2021 Update

Released January 2021

General Changes

Mailers+4 Build 3837 contains the new 2021 Postal rate changes that took effect January 24, 2021.


Build and Database Information

COM Object Build #
PresortObject 22372
AddressObject 17207
mdGeo 17187
PhoneObject 3145
NameObject 151


Presort Date
Zone Table 02/01/2021
Delivery Statistics 12/27/2020
Module L Label Lists 02/01/2021
ELOT Table 12/15/2020


Database Date
National Database 12/15/2020
FirstName Database 02/15/2000


Release Notes

PLEASE NOTE: You must install the December 2020 update (Mailers+4 Build: 3836 – Database Date: 12/15/2020) prior to the 2021 Rates patch.
The 2021 Rates Patch can be downloaded using one of the following methods:
Method Details
Mailers+4 Software Update The Mailers+4 Software Update should automatically prompt users to download the update when Mailers+4 is open.

This can be initiated manually by clicking "Help" – "Check for Program Updates" from the Mailers+4 Menu bar.

Mailers+4 Wiki Users can also Download the "2021 Rates Patch" located on the Mailers+4 Wiki under Current – Notices.

It can be found here: MAILERS+4


In order to confirm the most up-to-date builds are installed, please check the following within Mailers+4:
  • Click "Help" – "About Mailers+4" to confirm Mailers+4 build change to 3837.
  • Click "Help" – "Mailers+4 Information" to confirm Presort Object build change to 22372.


Please see our Product Advisory for additional information regarding the 2021 Price Changes.
It can be found here: https://blog.melissa.com/product-news-updates/2021-usps-postage-rates-effective-january-24th/