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Definition of Accountable mail
1. Noun. (American English) A category of mail in the US Postal Service including registered, numbered, insured, and certified mail. ¹
¹ Source: wiktionary.com
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1. Noun. (American English) A category of mail in the US Postal Service including registered, numbered, insured, and certified mail. ¹
¹ Source: wiktionary.com