They may refuse it, shred it, use it to level a desk, the only way to know is if they refuse it and you have a good return address. As long as you are okay supporting the USPS with much needed revenue, I strongly encourage trying it on a small scale and see how it works out.
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Go in person, buy some stamps, we've got some pretty cool ones lately. Retail stamp sales across the counter count more than online or self service kiosk purchases for our metrics and sales.
If you do buy stamps or postage online, only buy them from reputable resellers. Fraudulent postage is
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Comments
The DoD has its own rules and security concerns about incoming mail once it's in their custody as stated in that blurb.
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What you may run into is the non-USPS mail clerk at whatever agency you pick simply not knowing what to do with such a postcard.
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If you do buy stamps or postage online, only buy them from reputable resellers. Fraudulent postage is
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Thanks for your time trying to brighten up people's days!