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A courtesy reply envelope is a pre-addressed envelope a company sends you to make replying easy. Unlike a business reply envelope, it arrives without postage: you must stick your own stamp on it before dropping it in the mail. The business pays nothing for it; the convenience is the only thing it provides.
The two look alike: both are pre-addressed envelopes tucked into a bill, a survey, or a donation request. The difference is who pays the postage. A business reply envelope carries a printed permit imprint instead of a stamp, and the company pays postage plus a per-piece fee only on the envelopes that actually come back. A courtesy reply envelope has no postage at all. You supply the stamp, and if you forget it, the envelope will be delayed or returned.
| Feature | Courtesy reply envelope | Business reply envelope |
|---|---|---|
| Postage | You affix your own stamp | Prepaid by the business via permit |
| Cost to the business | Just the printing | Permit fees plus postage and a per-piece fee on returns |
| If you mail it with no stamp | Delayed or returned to you | Delivered; the business is billed |
| Best for | Low-response mailings where the business wants to keep costs down | High-response campaigns where friction kills returns |
Cost. A courtesy reply envelope costs the company a fraction of a cent to print and nothing more. Business reply mail requires a permit, an annual fee, and a per-piece charge on every envelope that returns, which adds up fast on a mass mailing. For bills and statements, where many customers pay online anyway, the courtesy envelope is a cheap nudge: it removes the "find an envelope and the address" friction without the company paying postage for replies that never come.
It also boosts response rates compared with sending nothing. Studies of direct mail keep finding the same thing: a pre-addressed envelope, even an unstamped one, gets more replies than a blank "please write to us" instruction. The company is betting that your convenience is worth more than your stamp.
First, check whether it actually needs a stamp. A business reply envelope says something like "no postage necessary" or shows a permit imprint; a courtesy envelope shows a blank corner where your stamp goes. Affix a stamp for the correct service: a standard letter stamp for a regular letter, and check the weight if you are stuffing in extra pages. Then drop it in any mailbox as usual.
One more thing: the address on a courtesy reply envelope usually goes to a processing center or a PO box, not the company's street address. That is normal. The mail is routed there on purpose so returns can be opened and sorted in bulk.
Better not to. The envelope is pre-addressed to the company's returns department, and it may carry printed codes that route it through their mailroom. If you cross out the address and write in your own, you are fighting the envelope's design: machine sorting reads what is printed, and a repurposed envelope is a good way to get your letter misrouted. Use a fresh envelope for your own mail, and save the courtesy one for its intended reply.
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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