How to Prepare Christmas Cards for Mailing

Preparing a Christmas card for mailing takes about a minute once you know the steps: write and sign the card, add any enclosure flat against it, address the envelope in the format USPS machines read best, add your return address, weigh anything that feels heavy, apply the right postage, and seal it well. Most cards that get delayed, surcharged, or returned fail on one of those basics — not on anything complicated.

Step 1: Write, sign, and assemble the card

Sign the card before it goes into the envelope, and let ink dry fully — gel and fountain pen ink smudge against glossy photo cards. If you are including a photo, a family newsletter, or a gift card, place it inside the card rather than loose in the envelope, and keep the package as flat and even as possible. USPS treats envelopes with uneven thickness as nonmachinable, which adds a surcharge; a bulky enclosure like a keychain or a thick stack of photos belongs in a small padded mailer sent as a package, not in a card envelope.

Step 2: Address the envelope correctly

USPS sorting equipment reads the delivery address in the center of the envelope. Use this format:

MS JANE DOE
123 MAPLE ST APT 4B
SPRINGFIELD IL 62704

Practical rules:

• Print or write in dark ink, in simple, legible lettering — script fonts and light colors slow down processing.
• Put the delivery address in the middle, and your return address in the upper-left corner (formal etiquette allows the back flap; the corner is the safer choice for machine processing).
• Use the correct ZIP Code, and ZIP+4 if you know it. A wrong ZIP is the single most common cause of a “mysteriously late” card.
• Keep the bottom 5/8 inch of the envelope clear — that strip is where USPS prints its barcode.

For the etiquette side — how to list families, couples, and titles on the envelope — see how to address Christmas cards properly, and for the general USPS layout, how to address an envelope in the USA.

Step 3: Check the envelope against letter rules

To travel at the letter rate, an envelope must be rectangular and within these limits:

Measurement	Letter minimum	Letter maximum
Length	5 inches	11-1/2 inches
Height	3-1/2 inches	6-1/8 inches
Thickness	0.007 inch	1/4 inch
Weight	—	3.5 ounces

Anything larger is priced as a large envelope (flat), starting at $1.69. Two situations change the price even when the envelope is letter-sized:

• Square envelopes. A square shape cannot run through sorting machines, so USPS adds a nonmachinable surcharge. Square, oversized, or unusually shaped envelopes start at $1.31 instead of $0.82.
• Rigid or lumpy contents. Envelopes that do not bend, or that have clasps, strings, or buttons, are also nonmachinable.

Do greeting cards need extra postage? walks through these cases in detail.

Step 4: Weigh and apply postage

A standard card in its envelope usually weighs well under one ounce and needs exactly one Forever stamp — currently 82 cents. Each additional ounce costs 29 cents:

Sealed envelope weight	Postage due
Up to 1 oz	$0.82 (one Forever stamp)
Up to 2 oz	$1.11
Up to 3 oz	$1.40
Up to 3.5 oz	$1.69

A kitchen scale is accurate enough to check a questionable envelope. If you are between ounces, USPS rounds up to the next ounce. When in doubt at the Post Office counter, staff will weigh and rate the piece for you. Place stamps in the upper-right corner; multiple stamps go side by side, not overlapping.

Special handling for special cards

A few card types deserve an extra minute before drop-off:

• Photo cards and anything marked “do not bend”: A rigid photo mailer protects the contents, but rigidity makes the envelope nonmachinable. Take it to the counter and let staff rate it rather than guessing.
• Cards with wax seals, ribbons, or clasps: Decorations on the outside snag in sorting equipment and trigger the nonmachinable surcharge. Put the decorated envelope inside a plain outer envelope for mailing, or hand-carry it to the Post Office and ask about hand-cancellation.
• Hand-canceling: Many Post Offices will hand-cancel stamps on request at the counter — worth asking for a small number of special cards, especially ones with calligraphy or seals.
• Cards that end up short on postage: USPS may return an underpaid piece to you or deliver it with postage due to the recipient — an awkward outcome for a greeting. Weighing the one questionable envelope prevents it.

A worked example: preparing one tricky card

Consider the card that causes trouble every year: a square greeting card, a family photo tucked inside, and a gift card for the recipient. Work through it step by step:

1. Assemble it flat. The photo and gift card go inside the folded card, gift card against the card’s spine, so the envelope’s thickness stays as even as possible.
2. Address it. Square envelopes rotate in handling, so write the address in the orientation you want read, keep the bottom edge clear for the barcode, and add the return address in the upper-left corner.
3. Check the shape first. The envelope is square, so the $0.49 nonmachinable surcharge applies before weight is even considered. Base postage is $0.82 + $0.49 = $1.31.
4. Weigh the sealed envelope. Card, photo, and gift card together come to 1.4 ounces on the kitchen scale. USPS rounds up, so this is a 2-ounce piece: add $0.29 for the second ounce.
5. Total postage: $1.31 + $0.29 = $1.60. That can be a Forever stamp plus 78 cents in additional stamps — or a trip to the counter, where a clerk will meter it exactly. What it cannot be is a single Forever stamp: at $0.82, this envelope is 78 cents short and risks coming back or arriving postage due.

Compare the same contents in a standard rectangular envelope: no surcharge, so postage is $0.82 + $0.29 = $1.11. The square shape alone cost 49 cents — which is why the check order matters: shape first, then weight.

More preparation mistakes that delay cards

• Writing “Do Not Bend” and assuming that changes the rate. The words are a handling request, not a postage category. A rigid mailer is still nonmachinable; pay for how the piece actually travels, and see USPS letter size and weight requirements for the exact thresholds.
• Addressing in pencil, gel glitter ink, or pale colors. Sorting cameras need contrast. A beautiful pale-gold address on a cream envelope is a card that gets hand-sorted — slowly — or returned as illegible.
• Taping an enclosure to the outside, or sealing the envelope with tape over the flap edges. Exposed adhesive and protruding edges catch in sorting equipment. Everything goes inside; the flap seal alone closes the envelope.
• Overstuffing until the envelope bulges. Once a letter passes 1/4 inch thick — or becomes uneven enough that it cannot flex — it stops pricing as a plain letter even if it weighs under an ounce. Move thick stacks to a large envelope, which starts at $1.69, instead of forcing them into a card envelope.
• Using last year’s envelope from a boxed set without checking its size. Some decorative sets include envelopes over 6-1/8 inches high. Those are large envelopes for postage purposes no matter what the card inside weighs.

Preparing a full batch: one Atlanta evening, forty cards

Preparation scales better than people expect. A sender in Midtown Atlanta sits down on the first Sunday of December with 40 cards and works the steps above as an assembly line rather than as 40 separate projects.

The return address goes in the upper-left corner of every envelope first, before any recipient is addressed:

M CARTER
1020 PEACHTREE ST NE
ATLANTA GA 30308

Then the delivery addresses, written in the same block style USPS machines read best — for example, a card going across town:

MS GRACE LIN
317 W TRINITY PL
DECATUR GA 30030

(Both addresses are illustrative examples.) The batch holds the usual traps, and the steps catch them in order. Three cards are square, so the shape check flags them before postage is even considered: each starts at $1.31. One card goes to family in Toronto, so it is set aside for a Global Forever stamp at $1.75. A sample of the standard card — with its photo insert — goes on the kitchen scale and reads 0.9 ounces, so the remaining standard cards are safely one-ounce pieces. The postage count:

• 36 standard cards × $0.82 = $29.52
• 3 square cards × $1.31 = $3.93
• 1 international card × $1.75 = $1.75
• Total postage: $35.20

The square cards and the Toronto card are the ones carried to a Post Office counter rather than dropped in a collection box — not because the box would fail them, but because the counter confirms the two unusual rates on the spot. The other 36 go into the sender’s own mailbox across two mornings, each batch out before the carrier’s usual round. Start to finish, the evening takes about ninety minutes — because preparation is a sequence, not a scramble, and every exception in the stack was identified while it was still on the table.

Step 5: Seal and drop off

Moisten or peel-and-stick the full length of the flap — a partially sealed envelope can catch in sorting equipment. Then choose a drop-off method:

• Your own mailbox works for stamped cards in most areas; raise the flag so the carrier knows outgoing mail is waiting.
• A blue USPS collection box — check the collection time printed on the box. Mail dropped after the last posted pickup moves the next business day.
• A Post Office counter is the best choice for anything nonmachinable, overweight, or valuable, because staff can confirm the postage on the spot.

Timing matters as much as preparation: in 2026, the last recommended First-Class mailing date is December 17, and December 1–10 is the comfortable window. Work through our Christmas card mailing checklist before you drop a stack in the box, and browse the rest of our holiday mailing guides for timelines and etiquette.

Frequently Asked Questions

Can I put a gift card inside a Christmas card?

Yes — place it inside the folded card so the envelope stays as flat and even as possible. Then weigh the finished piece: a gift card plus a photo can push an envelope past one ounce, and a rigid lump can make it nonmachinable even at letter weight.

What happens if my envelope is thicker than 1/4 inch?

It no longer prices as a letter. Move the contents to a large envelope, which starts at $1.69, or send the piece as a package. Forcing a thick stack into a card envelope risks a surcharge or a return.

Does writing “Do Not Bend” change the postage?

No. It is a handling request, not a rate category. A rigid photo mailer is nonmachinable regardless of what is written on it, so have rigid pieces rated at the Post Office counter rather than guessing.

Sources

The rates, dates, and rules in this guide were checked against these official USPS pages:

• USPS: First-Class Mail
• USPS: Holiday Shipping Dates

Related Guides

• Holiday mailing guides — the full hub for this series, covering timelines, preparation, and etiquette.
• Christmas card mailing checklist — the two-pass checklist version of these preparation steps.
• How to address Christmas cards properly — forms of address and envelope etiquette in detail.
• Do greeting cards need extra postage? — every shape and enclosure that triggers the surcharge.