United States Postal Service Mail Guidelines
"...The Federal Post Card Application (FPCA), the back-up Federal Write-In Absentee Ballot (FWAB), acknowledgement cards, and other election materials can all be sent postage paid via First-Class Mail to citizens covered by Uniformed and Overseas Citizens Absentee Voting Act (UOCAVA). For specific guidelines for preparing ballot materials, review Section 703.8.0 of the USPS Domestic Mail Manual or the USPS Election Officials' Mailing Resource Site ..." 
Source: www.fvap.gov - Federal Voting Assistance Program
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