Starting up
Do I need a storefront to be a CMRA?
Straight answer
No. USPS requires a CMRA to operate from a commercial delivery address where mail can be received during business hours, not a retail storefront. An office suite, business center, or coworking space qualifies. A residential address does not work in practice, because the postmaster expects a staffed commercial location when reviewing your Form 1583-A.
Checked September 3, 2026
What does the postmaster look for when I file Form 1583-A?
A real commercial address that already receives carrier delivery, a person present to accept mail during stated business hours, and a business that visibly occupies the space.
- A physical commercial address on the carrier's route, not a P.O. Box and not an address that only exists on paper.
- Someone on site during business hours to accept mail, including accountable mail that needs a signature.
- The legal business name, the owner or manager, and hours of operation, all stated on the 1583-A.
- Evidence the business is actually there: a lease, signage, or a listing on the building directory.
The postmaster or a designee verifies the form, signs it, and keeps it. From then on the address is flagged as a CMRA address, and USPS expects every customer served there to have a Form 1583 on file and in the CRD.
Can I run a CMRA from my home?
In practice, no. Postmasters generally decline residential addresses, and your customers' mailing addresses would resolve to a house.
Nothing about a home address gives the postmaster what the form asks for: business hours, a staffed counter, and a commercial delivery point. Beyond the filing, your customers' addresses are the product. A business customer using a residential street address with a PMB number looks like exactly what it is.
Does an office or coworking space count?
Yes. An office suite, executive suite, business center, or coworking space with a commercial address and staffed hours qualifies just as a retail store does.
Many CMRAs have no retail frontage at all. What matters is that the address receives carrier delivery, someone is there to accept it, and the business filing the 1583-A actually occupies the space. If you are a tenant, make sure the building's mail room is not intercepting mail before it reaches you.
Do I need a physical mailbox wall?
No. A PMB number is a logical designation, not a piece of hardware. Virtual mailbox customers never need a physical box.
Shelves, bins, or folders keyed to PMB numbers are enough for a virtual operation. Innbocks assigns box numbers from number pools you define, so a customer's PMB number exists in the system before any hardware does. The full registration guide covers what to bring to the postmaster meeting.
How to become a CMRA
Form 1583-A, the postmaster meeting, CRD access, and your first customer's Form 1583.
Check your readiness before the postmaster does
The CMRA readiness score walks through the address, staffing, and record-keeping questions USPS will ask.