10 self-service mailing and printing tools, free — create a no-cost account to try them now Try the free tools Request a Quote
PlavidianOrder, proof, track, and manage your print and mail projects online.

Plavidian Workbench™

Plavidian Expert™

Your on-demand direct mail expert. Ask about tabbing, folds, piece sizes, postage eligibility, EDDM, or addressing and get a straight answer grounded in the USPS Domestic Mail Manual and the current Notice 123 price list. No sales call, no waiting on a rep.

USPS DMM effective 2026-07-12 Notice 123 effective 2026-07-12 3 free questions No account required

Grounded

Answers from the DMM

Every answer is drawn from the USPS Domestic Mail Manual and the current Notice 123 price list loaded in our system, not from general knowledge.

Specific

Built for real pieces

Ask about the piece you are actually printing: a 6 x 9 card, a quarter-folded 11 x 17, a saddle-stitched booklet, an EDDM flat.

Honest

It says when it is unsure

If the standard for your shape is not on file, it says so and points you to a rep instead of guessing. Pricing always defers to the estimator.

Ask Plavidian™

Your On-Demand Direct Plavidian Expert

Final mailability and pricing are confirmed by USPS at acceptance.

Answering from the USPS Domestic Mail Manual effective 2026-07-12 (1,918 sections indexed) and USPS Notice 123 effective 2026-07-12. Prices come only from the imported Notice 123, never an estimate.

Request a quote Plavidian Workbench

What people ask it

Question

Does an 8.5 x 11 tri-fold need tabs?

Yes. A tri-folded 8.5 x 11 self-mailer is letter-size and needs two non-perforated tabs on the top edge, with paper weight minimums that change above 1 ounce.

Question

Where can the address go on an 8.5 x 11?

Unfolded it mails as a flat, so the address goes in the top half of the piece and may run parallel or perpendicular to the short top edge.

Read the guides behind the answers

The Plavidian Expert answers from the same USPS standards we work to every day. Browse them directly.

USPS Mail Classes Explained

First-Class, Marketing Mail, Nonprofit, Bound Printed Matter, and Media Mail: what each class is for, what it can contain, and how to choose.

Postcard, Letter, Flat, or Parcel: USPS Size Limits

The exact dimensions that decide whether your piece prices as a postcard, letter, flat, or parcel, plus the nonmachinable surcharge list.

Folded Self-Mailers and Tabbing Requirements

How many tabs a folded self-mailer needs, where they go, fold orientation, paper weight minimums, and when tabbing does not apply.

Mailing Booklets: Size, Spine, and Tabbing Rules

How a bound booklet mails: letter versus flat thresholds, spine orientation, tab count by weight, and paper stock minimums.

Automation and Presort: How to Earn the Lowest Postage

What machinable, nonmachinable, and automation mean, the presort minimums, and the requirements that unlock the lowest per-piece prices.

Carrier Route Density: Basic, High Density, and Saturation

How pieces per carrier route sets your postage, the Basic, High Density, High Density Plus, and Saturation thresholds, and whether filling a route that just misses actually pays.

Addressing, CASS, and Move Update Requirements

CASS processing, ZIP+4 and delivery point coding, the Move Update rule, and ancillary service endorsements for undeliverable mail.

Preparing a Mailing List

How to format a mailing list, why CASS and Move Update matter, deduplication and householding, and what drives the price your list qualifies for.

All mailing guides

Browse every USPS guide →