Informed Delivery Technical Requirements: IMb, Mailer ID, and What You Actually Need

The phrase "you need Full-Service Intelligent Mail barcodes" appears in nearly every Informed Delivery resource, followed by a string of acronyms—MID, STID, eDoc, BCG—that assume familiarity most business owners don't have. This guide cuts through the jargon to explain exactly what technical infrastructure Informed Delivery campaigns require, why those requirements exist, and what the path forward looks like for businesses at different stages of mailing sophistication.

The honest starting point: Informed Delivery isn't accessible to every business with a mailbox and a marketing idea. It's built on top of USPS's commercial mail infrastructure, which means participating requires either building that infrastructure yourself or working through someone who already has it. Understanding the requirements helps you assess which path makes sense for your situation.

The Foundation: Intelligent Mail Barcodes#

Every piece of commercial mail that participates in Informed Delivery must include an Intelligent Mail barcode, commonly abbreviated as IMb. This is the long barcode you see on most business mail—distinct from the shorter POSTNET barcode that was standard before 2013.

The Intelligent Mail barcode encodes significantly more information than older barcode formats. A single IMb contains data about the mail class and service level, the mailer's identity, and a unique serial number for that specific piece. This information allows USPS to track individual mailpieces through the processing system and link them to Informed Delivery campaigns.

Here's where the requirements get specific. Not any Intelligent Mail barcode qualifies for Informed Delivery—you need Full-Service Intelligent Mail barcodes. The distinction matters because USPS offers two tiers of IMb usage:

Basic IMb means you're applying barcodes to your mail for sortation benefits and basic USPS processing, but you're not participating in the two-way data exchange that Full-Service requires.

Full-Service IMb means you're providing USPS with electronic documentation about your mailing before it enters the mail stream, and in return, you receive scan data showing when and where your mailpieces were processed. This two-way communication is what makes Informed Delivery campaigns possible—USPS needs to know which pieces are part of your campaign so the right enhanced images appear for the right recipients.

Full-Service participation comes with specific requirements: unique serial numbers that aren't reused within 45 days, electronic documentation submitted before your mail is inducted, and validation that your data matches the physical mail. These requirements ensure the system can reliably connect your campaign content to the correct mailpieces.

Mailer ID: Your USPS Business Identity#

The Mailer ID (MID) is a 6 or 9-digit number that identifies your organization within USPS's mailing systems. Think of it as your business's account number for commercial mail operations—it connects your mailings, your electronic documentation, and your Informed Delivery campaigns to a single identity.

Obtaining a Mailer ID requires registering with USPS through the Business Customer Gateway, the portal where businesses manage their commercial mailing activities. The registration process involves identity verification and results in designation as a Business Service Administrator (BSA), the account type with permission to request and manage Mailer IDs.

The approval process typically takes 2-3 business days, though it can extend during busy periods. You'll need to provide business documentation and verify your identity through USPS's validation system. Once approved, your BSA account can request Mailer IDs and access the various USPS mailing tools, including the Mailer Campaign Portal for Informed Delivery.

There are two MID formats: 6-digit and 9-digit. The length affects how the barcode is structured. Businesses with higher mail volumes typically use 6-digit MIDs, which allow for more unique serial numbers per mailing. Smaller mailers often receive 9-digit MIDs. Both work for Informed Delivery campaigns—the format choice relates to your serial number capacity, not your campaign eligibility.

Service Type Identifier: Encoding Mail Class and Features#

The Service Type Identifier (STID) is a 3-digit code embedded within the Intelligent Mail barcode that tells USPS what kind of mail you're sending and what services it requires. Different combinations indicate First-Class Mail versus Marketing Mail, whether you want address correction services, and other handling specifications.

For Informed Delivery, the STID matters because it must indicate Full-Service participation. USPS publishes a table of valid STIDs (available at PostalPro) that shows which codes correspond to which mail classes and service levels. Your mailing software or mail service provider typically handles STID selection based on your mail class choice—you don't manually pick codes unless you're building your own mailing infrastructure.

The practical implication: when setting up a mailing, you need to specify Full-Service handling, and your barcode generation process needs to use the correct STID for your mail class. If your mailing uses Basic IMb codes instead of Full-Service codes, your Informed Delivery campaign won't connect properly because USPS won't have the electronic documentation linking your campaign to specific mailpieces.

Electronic Documentation: The Data Behind the Mail#

Full-Service Intelligent Mail requires electronic documentation, which means submitting data about your mailing to USPS before the mail is inducted. This documentation describes what you're mailing—recipient addresses, piece counts, service levels, and the unique serial numbers in your barcodes.

USPS accepts electronic documentation through two primary methods:

PostalOne! is USPS's electronic mailing system for commercial mailers. If you're producing your own mailings with compliant software, you can submit Mail.dat or Mail.XML files to PostalOne! containing your mailing data. This approach requires technical capability and integration with USPS's systems.

Through a Mail Service Provider is how most businesses participate in Full-Service mail. The MSP handles electronic documentation submission as part of their service—you provide them with your addresses and artwork, and they manage the technical compliance including eDoc submission.

The timing matters: electronic documentation must be submitted before your mail is inducted at a USPS facility. The documentation validates against your physical mail, so the data needs to accurately reflect what you're actually sending. Mismatches between documentation and physical mail can cause processing issues.

Business Customer Gateway: Your USPS Account Hub#

The Business Customer Gateway (BCG) is the web portal where businesses manage their USPS commercial mailing accounts. It's where you become a Business Service Administrator, request Mailer IDs, access PostalOne!, and reach the Mailer Campaign Portal for Informed Delivery.

Setting up BCG access is the first step for any business wanting to participate in Informed Delivery campaigns. The process involves creating an account, verifying your identity, and getting approved as a BSA. Identity verification can happen online (using questions about your credit history and public records) or through an in-person process if online verification fails.

Once you have BSA status, BCG provides access to various USPS tools:

Mailer Campaign Portal is where you create and submit Informed Delivery campaigns. You upload your ride-along and representative images, specify campaign dates, and link campaigns to your mailings using Mailer ID and serial number information.

PostalOne! access lets you submit electronic documentation and view mailing reports. This is the transactional side of Full-Service mail participation.

Various administrative tools let you manage your MIDs, delegate access to other users, and view account information.

Most of these tools assume commercial mailing expertise. If the terminology feels overwhelming, that's normal—these systems were designed for professional mailers, not general business users.

The Reality Check: Two Paths Forward#

Having laid out the technical requirements, let's be direct about what they mean for different types of businesses.

If you already mail at commercial volume through a printer or mail house, you may already be using Full-Service Intelligent Mail barcodes without realizing it. Many mail service providers include Full-Service compliance as a standard part of their offering. In this case, adding Informed Delivery campaigns might be a conversation with your provider about campaign management services.

If you're new to commercial mailing or currently send mail through regular USPS channels (stamps, metered mail), the infrastructure requirements represent a significant step up. Building Full-Service capability yourself requires mailing software, USPS certifications, and ongoing compliance management. For most businesses in this position, working through a mail service provider is more practical than building internal capability.

The key question isn't whether you can meet the technical requirements—with enough investment, any business can. The question is whether the benefits of Informed Delivery campaigns justify the infrastructure investment. For businesses sending occasional mailings, the answer is often no. For businesses with ongoing direct mail programs where the incremental cost per campaign is low, the math looks better.

Mail Service Providers: The Practical Path#

For most small and medium businesses, Mail Service Providers (MSPs) represent the realistic path to Informed Delivery participation. An MSP handles the technical requirements—barcode generation, electronic documentation, postal compliance—while you focus on your message and audience.

When evaluating MSPs for Informed Delivery capability, questions worth asking include:

Do you use Full-Service Intelligent Mail barcodes on all mailings? Some providers offer Basic IMb only, which doesn't support Informed Delivery campaigns.

Do you offer Informed Delivery campaign management? Not all Full-Service mailers provide campaign submission as a service—some handle the mail compliance but expect you to manage campaigns independently.

What's involved in setting up a campaign? Understand whether they handle image submission, or whether you need Mailer Campaign Portal access and manage campaigns yourself.

What reporting do you provide? Some MSPs pass through USPS reporting, others provide enhanced analytics, and some offer minimal visibility into campaign performance.

What are the costs? Campaign management may be included in per-piece pricing, charged as a flat fee per campaign, or billed as a separate service.

The MSP relationship determines your practical experience with Informed Delivery. A good provider makes campaigns relatively straightforward—you provide creative assets and campaign parameters, they handle technical execution. A provider without strong Informed Delivery support might leave you managing complex portal interactions yourself.

Timeline and Planning Considerations#

Understanding the timeline requirements helps avoid missed campaign opportunities.

Informed Delivery campaigns must be submitted by 12:59 PM local time the day before your campaign start date. USPS recommends building a 3-day buffer on either side of your expected mail delivery dates. This means for mail you expect to deliver on January 15, your campaign might run January 12-18 to account for delivery variability.

Working backward: if you want campaigns running for a January 15 delivery, your campaign submission needs to happen by January 11 (assuming January 12 start date). Your images need to be finalized before submission, your mailing needs to be prepared for induction, and any coordination with your MSP needs to happen earlier still.

For ongoing direct mail programs, establishing a consistent production calendar that accounts for these timelines prevents last-minute scrambles. Build campaign submission into your standard workflow rather than treating it as an afterthought.

Frequently Asked Questions#

Do I need my own Mailer ID for Informed Delivery, or can I use my mail service provider's?#

You can use your MSP's Mailer ID—campaigns are linked to mailings through the MID and serial number combination, regardless of whether the MID belongs to you or your provider. However, having your own MID gives you more direct access to USPS tools and reporting. Many businesses using MSPs never obtain their own MID and participate in Informed Delivery entirely through their provider.

Can I use Informed Delivery with metered mail or stamps?#

No. Informed Delivery campaigns require Full-Service Intelligent Mail barcodes, which are only available for commercial mail submitted with electronic documentation. Individual pieces sent with stamps or meter strips don't participate in the system that enables campaign linkage.

How long does it take to get set up for Informed Delivery from scratch?#

If starting with no commercial mailing infrastructure, expect several weeks to a few months. Business Customer Gateway approval takes 2-3 days minimum, but building Full-Service capability (either internally or through finding the right MSP) adds significant time. Working with an established MSP is faster than building internal capability.

What happens if my campaign dates don't align with actual mail delivery?#

If your mail delivers outside your campaign window, recipients see the default grayscale scan without your enhanced images. Early delivery means recipients might not see your campaign at all. Late delivery means the campaign may have ended before mail arrives. Building buffer days helps, but mail delivery timing is never perfectly predictable.

Is there a minimum mailing size required for Informed Delivery?#

USPS doesn't set a minimum piece count specifically for Informed Delivery. However, Full-Service Intelligent Mail requirements—particularly electronic documentation—are designed for commercial mail volumes. The infrastructure makes most sense for regular, substantial mailings rather than occasional small batches.

Making the Decision#

The technical requirements for Informed Delivery exist because the service depends on commercial mail infrastructure. USPS can link digital campaigns to physical mail because Full-Service mailers provide electronic documentation identifying each piece. Without that foundation, the connection between campaign images and specific mailpieces wouldn't be possible.

For businesses evaluating Informed Delivery participation, the question isn't whether you can eventually meet the requirements—with enough time and investment, the path exists. The question is whether the benefits justify the effort given your current mailing situation.

If you're already mailing at commercial scale with a capable MSP, adding Informed Delivery campaigns may be straightforward—a conversation with your provider about enabling campaigns for your mailings.

If you're new to commercial mail, the infrastructure requirements represent meaningful setup work. The value depends on your mailing plans: one-time campaigns rarely justify the investment, while ongoing direct mail programs can amortize setup costs across many campaigns.

The technical complexity is real, but it's also manageable with the right support. Understanding what's actually required—rather than being intimidated by acronyms—helps you make informed decisions about whether and how to pursue Informed Delivery as part of your direct mail strategy.