Postal rates go up on a regular basis. Be sure to double check your packages and parcels before sending, particularly if they are a size you don't typically mail. Don't risk the item coming back to you.
In some cases, using flat rate priority mail packaging simplifies the process of knowing amount of postage to put on the package, and you can purchase and print your own address label online. Visit the US Postal Service website for more details.
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Question: What was one of your favorite pieces of mail to receive in the last month?