Postcard Mailing: How to Plan, Print, and Send a Direct Mail Campaign

Postcard mailing works when you treat it as a production pipeline, not a design project: define the goal and audience first, then lock size and stock to mailing regulations, prepare print-ready art and a clean address list, choose a mail class and entry method, and only then compare quotes. This guide is for businesses planning a one-off or recurring postcard campaign through a print or mail house such as Cosmos Communications, which handles printing, direct mail, signage, and packaging and has operated since 1933.

Step 1: Define the goal and audience before any design work

Everything downstream — size, offer, list, mail class — follows from this decision.

• Goal: a single, measurable action. A store visit, a quote request, a phone call, a promo code redemption. "Awareness" is not measurable on a postcard.
• Audience: existing customer list, purchased or rented list, or a geographic area (which points toward saturation delivery rather than a named list).
• Offer: one offer per card. Two offers split response and confuse the call to action.

Write down the goal and the audience segment in one sentence each. If you cannot, the campaign is not ready to quote.

Step 2: Choose size, stock, and finish against mailing rules

Postcard size is not purely a design choice — it determines postage rate and whether the piece can be mailed at all.

Confirm the exact size and stock with your printer or mail house before finalizing artwork. Cosmos Communications takes quote requests by phone at 718.482.1800 ext. 222 or email at [email protected], and their stated process is built around asking what you need, when you need it, and where it has to be delivered.

Step 3: Prepare print-ready artwork and a clean mailing list

Two separate deliverables, both required before production starts.

Artwork

• Supply files at final trim size with bleed and safe margins.
• Keep critical text and the call to action inside the safe area.
• Convert fonts or supply them; flatten or package linked images.
• Get a physical proof if color accuracy matters — screen color and offset or digital output differ.

Mailing list

• Standardize addresses (street, city, state, ZIP) and remove duplicates.
• Run the list through postal address validation and NCOA (change-of-address) processing if your mail house offers it — this reduces undeliverable pieces.
• Decide whether the address is printed directly on the card or on a label. Direct printing usually looks cleaner and avoids label shifting.

Step 4: Choose how the mail enters the postal system

This is the step most first-time mailers underestimate, because it changes both cost and delivery speed.

• First-Class Mail: faster, forwarded and returned if undeliverable, higher postage. Better for time-sensitive offers.
• Standard (Marketing) Mail: lower postage, slower, generally not forwarded. Better for volume campaigns where timing is flexible.
• Presort / bulk entry: you or your mail house sort and bundle pieces to qualify for discounted postage. Requires volume and correct preparation.
• EDDM (Every Door Direct Mail): saturation delivery to carrier routes without a named address list. Useful for local reach; you give up targeting by name.

Ask your mail house which options your volume and list actually qualify for. Qualification rules are specific, and a piece prepared incorrectly can be rejected or charged at a higher rate.

Step 5: Estimate cost and timeline through quotes

Get quotes from at least two printers or mail houses, and ask each to break the quote into components so you can compare like for like:

• Printing (quantity, size, stock, finish, sides)
• List processing (validation, NCOA, dedupe)
• Addressing and personalization
• Mail preparation and postage
• Delivery or drop-shipping to the postal entry point

Cosmos Communications does not publish prices on its site; it directs prospects to request a quote by phone or email. Treat any cost figure you see elsewhere as an estimate until a vendor quotes your specific spec, quantity, and mail class.

Step 6: Track response and troubleshoot delivery problems

• Track: use a unique promo code, dedicated phone number, or landing page URL per campaign so responses are attributable.
• Measure: compare response against pieces mailed, not pieces designed — undeliverable pieces dilute your real response rate.
• Common issues:
  • Low response: usually an offer or audience problem, not a print problem. Test one variable at a time.
  • High returns: stale list. Re-run validation and NCOA before the next drop.
  • Late delivery: check whether you mailed Standard when the offer was time-sensitive, or missed a presort deadline.
  • Damaged pieces: stock too light for automated sorting equipment.

When postcard mailing is the right channel

Postcard mailing fits when you have a defined local or list-based audience, a single clear offer, and a lead time that allows for printing plus postal delivery. It fits less well when you need same-week response, when you have no usable address list and no geographic concentration for saturation mail, or when the offer requires explanation that will not fit on a card.

For a campaign that combines print with signage or packaging, Cosmos Communications positions printing, direct mail, signage, and packaging as one production relationship — useful if you want a single vendor handling multiple pieces of the same launch.