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A wax seal can survive the mail, but not through the normal machine stream: the raised seal jams sorting equipment and can crack or tear the envelope. Ask the post office to hand-cancel the envelope, which adds a small nonmachinable surcharge, or put the sealed envelope inside a larger outer envelope for full protection.
| Method | What happens to the seal | Extra cost |
|---|---|---|
| Drop it in a mailbox as-is | Seal likely cracks, smears, or tears the envelope in sorting machines | None, but the seal is the gamble |
| Hand-cancel at the counter | Clerk stamps it by hand, bypassing the machines; seal usually survives | Small nonmachinable surcharge per envelope |
| Sealed envelope inside an outer envelope | Outer envelope takes all the machine abuse; seal arrives pristine | Cost of the outer envelope plus its postage |
Mail sorting runs envelopes through rollers and belts at high speed, and the machinery expects a flat, uniform surface. A wax seal is a hard bump on an otherwise flat envelope: it catches, drags, and either snaps off, smears across the envelope face, or tears the paper around it. The thicker and more sculptural the seal, the worse its odds. Thin, flexible "faux wax" adhesive seals fare better than real poured wax, but they are still a bump the machines were not designed for.
You bring the envelopes to the post office counter and ask the clerk to hand-cancel them. They stamp the cancellation mark by hand instead of feeding the envelope through the cancelling machine, and they mark it nonmachinable so it travels the manual stream the rest of the way. You pay a small surcharge per piece on top of regular postage. Two practical notes: not every clerk does this cheerfully at peak hours, so go at a quiet time, and hand-cancelled mail can travel slightly slower since it skips the fastest automated path.
For weddings and other mailings where the presentation has to be perfect, the outer envelope is the safest option. You seal your beautiful envelope exactly as you want it seen, slide it into a larger plain envelope, and address the outer one. The recipient opens the outer envelope to find the sealed invitation untouched. It costs a second envelope and the larger size may need extra postage, but it removes every variable: no machine contact, no surcharge debate at the counter, no cracked wax.
Tradition puts the seal on the back flap, and the machines agree: a seal on the back flap sits over the thickest part of the envelope and presents a lower profile to the rollers than one on the front. The address side must stay clear anyway, since the post office needs a flat, scannable surface for the address and barcode. Keep seals modest in size and centered on the flap, and avoid placing them near the edges where rollers grip hardest.
The same physics applies: Canada Post sorts by machine, and a raised seal is equally at risk. Ask at the counter about nonmachinable handling for your piece; the product names differ from the US, but every postal service has a manual-handling option with a surcharge. The outer-envelope trick works identically in both countries and needs no special request.
Honestly, no. LetterAgent prints letters and mails them in standard double-window envelopes with no inserts and no special handling, which is the opposite of what a wax seal needs. Wax-sealed mail is a hand it to the counter job. Where LetterAgent fits is everything around the mailing: the text of the invitation or letter itself, printed and mailed normally. The service mails to US and Canadian addresses and is currently in private testing.
Ready to mail it? Send your letter with LetterAgent: describe it to your AI assistant, approve the exact quoted price, and it is printed and mailed.
LetterAgent is a working name. Prices include print, postage, and our service fee. US prices in USD, Canadian prices in CAD (Canadian prices exclude applicable sales tax, added at checkout). Currently in private testing.
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