**Intelligent Mail® barcodes and Mailer ID Usage**

The Mailer ID is a field within the Intelligent Mail® barcodes that is
used to identify Mail Owners and/or Mailing Agents. The IDs are assigned
by the USPS to each Mail Owner and/or Mailing Agent that requests them.
A Mailer ID can be a 9-digit field or a 6-digit field. The USPS assigns
6-digit or 9-digit Mailer IDs based upon the mail volume of the mailer.
Mailer ID's are used in the Intelligent Mail® Barcode, Intelligent Mail®
Tray Barcode, Intelligent Mail® Container Barcode and Intelligent Mail®
Package Barcode.

Mailer IDs can be obtained by contacting the *PostalOne!®* Help Desk at
800-522-9085 for letter and flat barcodes or the Confirmation Services
Help Desk at 877-264-9693 for package barcodes. If you wish to subscribe
to one of the services listed below, contact the appropriate toll-free
number:

OneCode Confirm™ 800-238-3150

OneCode ACS™ 800-331-5746

#### Mailer ID (MID) Assignment Guidelines for Letters and Flats

A single 6-digit or 9-digit MID will be assigned to any Mail Owner
and/or Mailing Agent for use with Intelligent Mail® barcodes on any of
their mailpieces, trays, sacks, tubs, or containers.

A 6-digit or 9-digit MID will be assigned to Mail Owners and/or Mailing
Agents based on their annual mail volume:

-   A Mail Owner who mails 10 million or more pieces annually will be
    assigned a 6-Digit MID. A Mail Owner can request multiple 6-digit
    Mailer IDs based upon need with a maximum of one MID per 10 million
    in annual mail volume.[^1]

-   A Mail Owner who mails less than 10 million annually will be
    assigned a 9-Digit MID. A Mail Owner can request multiple 9-digit
    Mailer IDs based upon need with a maximum of one 9-digit MID per 1
    million in annual mail volume. Error: Reference source not found

-   A Mailing Agent who mails 10 million or more mailpieces annually
    will be assigned one 6-Digit MID per location of mailing. A Mailing
    Agent can request multiple 6-digit Mailer IDs based upon need with a
    maximum of 10 MIDs per mailing location.Error: Reference source not
    found

-   A Mailing Agent who mails less than 10 million pieces annually will
    be assigned one 9-Digit MID per mailing location. A Mailing Agent
    can request multiple 9-digit Mailer IDs based upon need with a
    maximum of 10 MIDs per mailing location. Error: Reference source not
    found

    All 6-digit MIDs assigned by USPS® will begin with '0' through '8'.
    All 9-digit MIDs will begin with '9'.

    Mail Owners and Mailing Agents are encouraged to use the Mail
    Owner's MID in the Intelligent Mail® Barcode. Mailing Agents should
    provide Mail Owner identification information in the electronic
    mailing documentation.

#### Mailer ID (MID) Assignment Guidelines for Parcels

A single 9-digit MID will be assigned per Mail Owner and/or Mailing
Agent per location for use with Confirmation and Extra Services
barcodes. ^2^

Consolidators and 3PLs (3^rd^ party logistics providers) who induct mail
for multiple Mail Owners may request a unique MID for each of their Mail
Owners identifying their by/for relationship. ^2^

#### Frequently Asked Questions

1\. Question: I have heard about Mailer ID's for use Intelligent Mail
barcodes? Who do I contact for more information?

1\. Answer: You can find out more about Mailer IDs by contacting the
*PostalOne!®* Help Desk at 800-522-9085 for letter and flat barcodes or
the Confirmation Services Help Desk at 877-264-9693 for package
barcodes. If you wish to subscribe to one of the services listed below,
contact the appropriate toll-free number:

OneCode Confirm™ 800-238-3150

OneCode ACS™ 800-331-5746

2\. Question: If I am a current OneCode Confirm™ subscriber do I have to
obtain a new Mailer ID (MID) for use in the Intelligent Mail® Barcode?

2\. Answer: No. The USPS is transitioning all systems to support the
6-digit and 9-digit Mailer ID formats for use in the Intelligent Mail®
barcodes. Existing OneCode Confirm™ subscribers will have a "0" appended
to the beginning of the subscriber ID for use as an MID in the
Intelligent Mail® Barcode. You can use the Service Type indicator in the
Intelligent Mail® Barcode to selectively enable the OneCode Confirm™
service.

3\. Question: If I am not currently a OneCode Confirm™ subscriber and
have been assigned a 9-digit Mailer ID for use in my Intelligent Mail
Barcodes, can I use this same ID to obtain tracking information on my
mailpieces if I later purchase the OneCode Confirm™ service?

3\. Answer: No., not at this time. The USPS is working to support this
in the future. Currently, the USPS will assign you a new 6-digit Confirm
subscriber ID when you purchase the OneCode Confirm™ service and you
will need to use this subscriber ID for pieces that you wish to enable
for Confirm tracking.

4\. Question: If I am not currently a OneCode Confirm™ subscriber and
have been assigned a 6-digit Mailer ID for use in my Intelligent Mail®
Barcodes, can I use this same ID to obtain tracking information on my
mailpieces if I later purchase the OneCode Confirm™ service?

4\. Answer: At the time you apply for the Mailer ID and qualify for a
6-digit ID, please indicate your interest in signing up for the OneCode
Confirm™ service. The USPS will assign you a new 6-digit Mailer ID that
is compatible with the OneCode Confirm™ service.

5\. Question: If I'm already signed up for OneCode ACS™ and have
received a 6-digit subscriber ID, can I use this same ID on my
Intelligent Mail® barcodes even if I don't want to subscribe to OneCode
ACS™ for all mail pieces?

5\. Answer: You can use your OneCode ACS™ subscriber ID as the MID in
your Intelligent Mail® Barcodes and use the Service Type Identifier
field in the Intelligent Mail® Barcode to selectively turn on and off
OneCode ACS™. Careful consideration must be given to any endorsements
that may be applied to mailpieces. Please call the OneCode ACS™ helpdesk
for further clarification.

6\. Question: If I am currently assigned an ACS™ 7-digit subscriber ID
under the traditional ACS™ service, can I use that alpha ID as an MID in
the Intelligent Mail® Barcode, for OneCode ACS™ or OneCode Confirm™?

6\. Answer: No. You cannot use the ACS™ 7-digit subscriber ID as it is
an alpha-ID. The Intelligent Mail® Barcode only supports numeric values.

7\. Question: If I have been assigned a 9-digit ID for use in the
Intelligent Mail Barcode can I later purchase OneCode ACS™ and continue
to use this 9-digit ID to purchase OneCode ACS™ for my mailpieces?

7\. Answer: Yes, you will be able to use your 9-digit MID in your
Intelligent Mail Barcode to purchase OneCode ACS™. The USPS will
accommodate 9-digit Mailer ID's for use in OneCode ACS™.

8\. Question: If I have been assigned a 6-digit Mailer ID and later wish
to purchase OneCode ACS™ can I use the same Mailer ID?

8\. Answer: Yes. If you are using the same ACS treatment on all
mailpieces or across multiple classes of mail you can use the same
Mailer ID. The exception to this would be if you are purchasing OneCode
ACS™ for multiple mail classes or within one class of mail on multiple
mail pieces requiring different mailpiece disposition treatments. If you
want different treatments for the different classes of mail or if you
want different treatments for mailpieces within the same class, you will
need a Mailer ID for each endorsement that reflects the desired
treatment. Contact the OneCode ACS™ helpdesk for additional information.

9\. Question: If I have a OneCode Confirm™ 6-digit subscriber ID, can I
use the same subscriber ID for OneCode ACS™?

9\. Answer: Yes. If you are using the same ACS treatment on all
mailpieces or across multiple classes of mail you can use the same
Mailer ID. The exception to this would be if you are purchasing OneCode
ACS™ for multiple mail classes or multiple mail pieces requiring
different treatments. If you want different treatments for the different
classes of mail or if you want different treatments within the same
class, you will need a Mailer ID for each endorsement. Contact the
OneCode ACS™ helpdesk for additional information.

10\. Question: What classes of mail can OneCode ACS™ be used on and what
ancillary service endorsements options that controls how a mailpiece is
to be handled will be supported in the OneCode ACS™ program?

10\. Answer: The below table provides the classes of mail and the
ancillary service endorsement options that will be available for use
within the OneCode ACS™ program.

+------------------+----------------+----+---+----------------+---+---+
|                  | Address        |    |   | Change Service |   |   |
|                  | Service        |    |   | Requested\     |   |   |
|                  | Requested      |    |   | Options 1 2    |   |   |
|                  |                |    |   |                |   |   |
|                  | Options 1 2    |    |   |                |   |   |
+------------------+----------------+----+---+----------------+---+---+
| First-Class      | September 2006 | Y  | Y | October 2007\  | Y | Y |
| Letters          |                |    |   | (Planned)      |   |   |
+------------------+----------------+----+---+----------------+---+---+
| First-Class      | May 2007       | Y  | Y | May 2007       | Y | Y |
| Flats            |                |    |   |                |   |   |
+------------------+----------------+----+---+----------------+---+---+
| Periodical       | May 2007       | Y  | N | Not Applicable |   |   |
| Letters          |                |    | A |                |   |   |
+------------------+----------------+----+---+----------------+---+---+
| Periodical Flats | May 2007       | Y  | N | Not Applicable |   |   |
|                  |                |    | A |                |   |   |
+------------------+----------------+----+---+----------------+---+---+
| Standard Letters | October 2007\  | Y  | N | October 2007   | Y | N |
|                  | (Planned)      |    | A | (Planned)      |   | A |
+------------------+----------------+----+---+----------------+---+---+
| Standard Flats   | October 2007\  | Y  | N | October 2007   | Y | N |
|                  | (Planned)      |    | A | (Planned)      |   | A |
+------------------+----------------+----+---+----------------+---+---+
| Package Services | In Planning    |    |   |                |   |   |
| With Intelligent | Phase          |    |   |                |   |   |
| Mail Barcode     |                |    |   |                |   |   |
+------------------+----------------+----+---+----------------+---+---+

11\. Question: If I am a OneCode ACS™ participant and uniquely barcode
my mailpiece and it undergoes a change of address will I get the
original barcode information in addition to the changed barcode?

11, Answer: Yes, with some exceptions. OneCode ACS™ notices provided
back to you are designed to provide the entire 31 digits from the
original IM™ barcode. Currently, a small percentage of OneCode ACS™
notices may not include the original Barcode ID, Service Type, and
Delivery Point ZIP Code values. By fall of 2008 the OneCode ACS™ notices
will contain all 31 digits from the original IM™ barcode. All OneCode
ACS™ notices of a customer's change of address will include at minimum
the Sequence Number within the original barcode. In addition, both the
old and new address information is provided in the OneCode ACS™ record
returned to you.

12\. Question: I currently have a DUNS number that I use for my
Intelligent Mail® Package Barcodes, do I have to get a different MID?

12\. Answer: No. Existing Mail Owners and/or Mailing Agents that are
using their DUNS Numbers for identification in their Intelligent Mail®
Package Barcodes will be allowed to continue their use of their 9 digit
DUNS as their MID. These existing DUNS will be grand-fathered for Mail
Owners and/or Mailing Agents to use only on their parcel mailings. The
grand-fathered 9-digit DUNS whose first digit is '0' through '8' is not
allowed for use on Mail Owner and/or Mailing Agents Letter or Flat mail
volume. If needed, a new MID will be assigned for use in the Intelligent
Mail® Barcode on Letter and Flat mailings.

13\. Question: Can I use the DUNS number assigned for my Intelligent
Mail® Package Barcodes as the MID in Intelligent Mail® Barcodes for my
Letter and Flat mailings?

13\. Answer: Yes, as long as you were assigned a 9-digit ID beginning
with "9

14\. Question: I was previously assigned a 6-digit MID for my Letter and
Flat mailings. Can I use this MID for my Intelligent Mail® Package
barcodes?

14\. Answer: No. Intelligent Mail® Package barcodes for Confirmation and
Extra Services require a 9-digit MID. You can get a new MID for your
package barcodes by contacting the Confirmation Services Help Desk at
877-264-9693.

[^1]: Requests for additional MIDs will be evaluated on a case-by-case
    basis.

    ^2^ Under unique circumstances, a 6-digit MID may be authorized for
    customized solutions with approval from the Manager of Product
    Information Requirements. Use of a 6-digit ID will require the
    authorized shipper to include the Mail Owners MID in electronic
    manifest file submitted by the shipper.