This is CNBC's Morning Squawk newsletter. Subscribe here to receive future editions in your inbox. Happy Friday. Have any letters you've been meaning to send? You might want to get them in the mail sooner rather than later: The U.S. Postal Service is looking to hike prices as it goes through what it calls a "severe financial crisis." Stock futures are little changed this morning after adding to their post-ceasefire rally in yesterday's session. Here are five key things investors need to know to

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