Postcards vs. Self-Mailers: Make Your Message Fit the Mailer
A postcard is one piece of card stock with print on both sides. No envelope, no flap, nothing to open. Whatever is on it gets seen on the walk back from the mailbox, whether the person meant to read it or not.
A self mailer works differently. It’s a sheet of paper folded into panels and sealed with small tabs or glue. People see the cover, decide, and if it does its job, open it to find four, six, or even twelve panels.
That’s the trade. The postcard format gets read almost by default. The self mailer format has to earn the open, but it can carry a longer argument. When picking a direct mail format, count what a customer must believe before calling. A card can carry one or two. Past that, you’ll want the folds.
Postcards Win When The Offer Is Short And Urgent
Cards are at their best when the whole pitch fits in a headline. A $49 furnace tune-up that expires November 15. A reminder that a dental cleaning is overdue. Nobody needs three panels for that. It’s why lawn care, pest control, and HVAC companies send so many direct mail postcards, and why their postcard design can stay this simple.
They also cost less to print, which makes them our pick for testing a new targeted mailing list before anyone pays for folding and tabbed. A card can also open a longer mail marketing plan, with a folded piece sent later to responders.
A single mailing of postcards will usually not yield results. When your postcard arrives in someone’s mailbox on Tuesday, for example, it will most likely sit on the counter until they can find time to look through their mail. Therefore, plan to send multiple postcards (two or three) to the same addresses every couple of weeks.
Self Mailers Earn Their Cost When Buyers Need Details
The cost of each fold/tab will add up over time. Therefore, every section must be worth the money. When you have two products/services to compare (e.g., implants vs. clear aligners at a dental practice, or three maintenance options for an HVAC contractor), a single-sided card would result in small print that no one would read. Folds provide additional space for self-mailers to present their message.
The self mailer marketing approach can also be used for items being delivered according to a regular schedule. Many businesses utilize the self-mailer method to deliver their newsletters. A consistent newsletter delivery schedule will keep readers engaged. Including a perforated coupon within one of the inner panels will make the customized direct-mail item easy for your receptionist to track.
Neither format suits account balances or medical details. Anyone can read a card, and tabs aren’t a lock.
USPS Size And Weight Rules Set The Postage On Each Format
The USPS Domestic Mail Manual has set the maximum sizes, thicknesses, weights, etc., for mailing items. As long as you are mailing an item after October 2026, the following limits apply. If your item does not meet these limits, it may be possible to mail the item.
However, you will most likely have to pay a higher rate for a regular letter, non-machineable letter (one that cannot be processed by the sorting machines), or flat.
Check Postcard Size And Thickness
Since August 2021, commercial presorted and automated first-class postcards can go up to 6 x 9 inches. Thickness trips people up more often than size. Any card bigger than 4.25 x 6 has to be between 0.009 and 0.016 inches thick.
Printers measure stock in points, each a thousandth of an inch, so standard 14 pt card sits comfortably inside that range. Most postcard printing services also offer 16 pt, which lands right on the ceiling. Want that heavier feel? Ask for a measured sample.
Fold And Tab Each Self Mailer Correctly
Letter-size folded pieces can be up to 6 x 10.5 inches, weigh up to 3 ounces, and have up to 12 panels, with the final fold on the bottom edge. Up to 1 ounce, USPS wants paper of at least 70-pound weight and two 1-inch tabs or an approved glue line.
Go heavier, and it’s 80-pound paper with 1.5-inch tabs. Tabs wrap over the open edges, so keep logos and main copy clear of them during self mailer design.
Good Layout Decides Whether Each Format Gets Read
Write One Headline And Check The Proof
Good postcard design starts with one benefit headline on the image side, big enough to read at arm’s length. David Ogilvy, who founded the agency Ogilvy & Mather, wrote that “on the average, five times as many people read the headlines as read the body copy.” On the proof, check three things.
- One offer and one way to respond, like a phone number or QR code
- A clear address area at least 2.125 inches wide on the right side
- A real date for the deadline, not “limited time only”
Plan The Panel Order
The folding pieces of the booklet will be unfolded in a specific sequence; therefore, arrange the pieces in the same order as they are to be unfolded. Place the front cover piece at the top, the inside of the booklet piece (offer) directly below the front cover piece, the center spread (reviews or before and after) directly below the inside of the booklet piece, and the telephone number piece at the bottom.
A folded self mailer is a sealed brochure, which means most self mailer printing companies will print both types of brochures using the same machines. Ask for a folded sample of your brochure to see what it looks like before you order.
A Split Test Shows Which Format Pays Off
You don’t have to guess which direct mail format will pull better. Ask the direct mailing agency on your job to split test one offer in both formats before the main drop.
- Split a clean mailing list into two matched groups.
- Give each group its own phone number, QR code, or landing page.
- Mail both on the same day so timing doesn’t muddy the results.
- Divide each format’s total cost by the responses it brought in.
Let’s say 5,000 postcards cost $2,400 to print and send, and they generate 60 phone calls. The cost per phone call is $40. Now let’s say 5,000 folded mailers cost $3,600 and generate 110 phone calls. The cost per phone call is approximately $33. Therefore, the more expensive mailing piece generated the better return on investment.
Each time you send out a new recurring direct mail campaign (i.e., every month), test again and record the offer and self-mailer message that was used. When you start your next direct mail campaign, it will be based upon actual numbers rather than what you think may happen.
Frequently Asked Questions
What Is A Self Mailer In Direct Mail?
It’s a folded promotional piece that mails without an envelope and stays closed with tabs or glue. A self mailer can be a bi-fold, a tri-fold, or a multi-page newsletter.
What Sizes Do Folded Mailers Usually Come In?
Two common ones are an 8.5 x 11 sheet tri-folded to 8.5 x 3.67 inches and a 12 x 9 sheet folded once to 6 x 9. Settle the size before self mailer design starts, because the folds decide how wide every panel can be.
Is A Postcard Cheaper To Mail Than A Self Mailer?
For postage, yes, when it goes First-Class, since qualifying cards get a lower price there. That’s a real point for the postcard format. USPS Marketing Mail has no separate card price, though, so a letter-size card and a letter-size self mailer can pay the same.
What Size Postcard Qualifies For The USPS Postcard Rate?
The U.S. Postal Service (USPS) Domestic Mail Manual specifies that a stamped retail postcard must be no smaller than 3.5 inches by 5 inches and no larger than 4.25 inches by 6 inches. First Class Direct Mail Postcards (both commercial presorted and automated) may be up to 6 inches by 9 inches, provided that they are within the thickness range of 0.009 to 0.016 inches.
Which Format Gets A Better Response Rate?
Neither of these direct mail formats wins every time. Postcard marketing tends to do well with short, urgent offers, and self mailer marketing usually does better when the offer needs explaining. A split test measured by cost per response gives the answer that counts.
Final Thoughts
If your offer fits in one headline with a deadline, mail a card. If people have to compare options before they call, give them the panels of a self mailer.
Not sure which side your offer falls on? Send it and your mail date to MailProsUSA for a free quote and a straight format recommendation.
The company operates as a direct mail agency and postcard marketer. Therefore, it provides postcard and self-mailer printing services, presorting, and USPS entry at the same location. Please request a quote today for your next custom direct mail piece to be delivered to mailboxes on time.
