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How to mail a letter You can send your first letter with DocuPost in less than a minute. Here's how to get started. How to cancel a sent letter After mailing a letter, you have a limited time window to cancel your mail piece. How to mail a check Save time and give your checks a professional feel by mailing paper checks with DocuPost How to mail a postcard DocuPost lets you easily mail personalized 4x6 postcards. Why does my mailing say "Error" or "Requires review"? If you have tried to mail something but it says "Error", here are some common issues.

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