Mail-in Sweepstakes Entries: Cards Versus Postcards

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I just had an email from a reader who asked this question about mail-in entries.

I have a quick question for you.  I want to do alot of mail-ins, do you have a recommendation on how could do a 3×5 card without an envelope?  Something I can just put my info on one side and address it with a stamp on the other?

Here is my answer:

You can never send a 3×5 card in the mail without an envelope. It is too small to go through the postal system and they would reject it. The smallest mailable postcard is 3 by 5-1/2 inches.

From the USPS Site: Postcard Dimensions Not less than 3-1/2 inches high, 5 inches long, and 0.007 inch thick.

If you want to take a look at it, here is what the US Postal Service requires and says about mail sizes

If the sweepstakes official rules specify a 3×5 card then you must put it in an envelope. Anything outside of an envelope would be considered a postcard and unless they specifically specify postcard then you should not send one.

Read more about mail-in sweepstakes and using postcard in the mail for sweepstakes.

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